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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "FDA: Home Use Tests Glossary",
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          "name": "Quick comparison",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#quick-comparison"
        },
        {
          "name": "What CLIA means",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#what-clia-means"
        },
        {
          "name": "What CLIA does not mean",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#what-clia-does-not-mean"
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        {
          "name": "What FDA review means",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#what-fda-review-means"
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        {
          "name": "What FDA review does not mean",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#what-fda-review-does-not-mean"
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        {
          "name": "How to check a test before buying",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#how-to-check-a-test-before-buying"
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        {
          "name": "Where this matters most",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#where-this-matters-most"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#related-guides"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/clia-certified-lab-fda-authorized-test.html#related-guides-heading"
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          "name": "HHS: Who Must Comply with HIPAA",
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          "name": "HHS: Treatment, Payment, and Health Care Operations",
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          "name": "HHS: Health Information Privacy",
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          "name": "MedlinePlus Genetics: DTC Genetic Testing Privacy",
          "url": "https://medlineplus.gov/genetics/understanding/dtcgenetictesting/dtcprivacy/"
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          "name": "NHGRI: Genetic Discrimination",
          "url": "https://www.genome.gov/about-genomics/policy-issues/genetic-discrimination"
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        {
          "name": "FTC: Protecting Your Privacy Online",
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          "name": "Privacy questions by testing path",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#privacy-questions-by-testing-path"
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        {
          "name": "HIPAA is important, but it is not universal",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#hipaa-is-important-but-it-is-not-universal"
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        {
          "name": "Other rules can still matter",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#other-rules-can-still-matter"
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        {
          "name": "Insurance can create a paper trail",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#insurance-can-create-a-paper-trail"
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        {
          "name": "Genetic data has family implications",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#genetic-data-has-family-implications"
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        {
          "name": "Questions to ask before ordering",
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        {
          "name": "When privacy should change the testing path",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#when-privacy-should-change-the-testing-path"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#related-guides"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-privacy-insurance-data-sharing.html#related-guides-heading"
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          "name": "HealthCare.gov: Preventive Care Benefits for Adults",
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          "name": "CMS: How to Read an Explanation of Benefits",
          "url": "https://www.cms.gov/medical-bill-rights/help/guides/explanation-of-benefits"
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          "name": "CMS: How to Read Your Medical Bill",
          "url": "https://www.cms.gov/medical-bill-rights/help/guides/how-to-read-bill"
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          "name": "CMS: Hospital Price Transparency for Consumers",
          "url": "https://www.cms.gov/hospital-price-transparency/consumers"
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          "name": "CMS: Know Your Rights",
          "url": "https://www.cms.gov/medical-bill-rights/know-your-rights"
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          "name": "CMS: Ending Surprise Medical Bills",
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          "name": "MedlinePlus: Laboratory Tests",
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          "name": "Why the price changes",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-cost-insurance-cash-pay.html#why-the-price-changes"
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        {
          "name": "Preventive is not the same as free for every lab",
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        {
          "name": "What an EOB can tell you",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-cost-insurance-cash-pay.html#what-an-eob-can-tell-you"
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        {
          "name": "Cash pay can be useful, but it has tradeoffs",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-cost-insurance-cash-pay.html#cash-pay-can-be-useful-but-it-has-tradeoffs"
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        {
          "name": "Price transparency helps, but it is incomplete",
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          "name": "Surprise-bill questions",
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        {
          "name": "Questions to ask before nonurgent testing",
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        {
          "name": "When not to price-shop first",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-cost-insurance-cash-pay.html#when-not-to-price-shop-first"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-cost-insurance-cash-pay.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-cost-insurance-cash-pay.html#related-guides"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/lab-test-cost-insurance-cash-pay.html#related-guides-heading"
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      "topicName": "Blood tests",
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          "url": "https://medlineplus.gov/lab-tests/what-you-need-to-know-about-blood-testing/"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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        {
          "name": "MedlinePlus: Medical Tests",
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        {
          "name": "MedlinePlus: Laboratory Tests",
          "url": "https://medlineplus.gov/laboratorytests.html"
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        {
          "name": "HealthCare.gov: Preventive Care Benefits for Adults",
          "url": "https://www.healthcare.gov/preventive-care-adults/"
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          "name": "USPSTF: A and B Recommendations",
          "url": "https://www.uspreventiveservicestaskforce.org/uspstf/recommendation-topics/uspstf-and-b-recommendations"
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        {
          "name": "CDC: Getting Tested for STIs",
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          "name": "Four reasons to order bloodwork",
          "url": "https://mainstreetbloodlab.com/articles/routine-blood-tests-preventive-health-optimization.html#four-reasons-to-order-bloodwork"
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          "name": "Common routine blood tests people ask about",
          "url": "https://mainstreetbloodlab.com/articles/routine-blood-tests-preventive-health-optimization.html#common-routine-blood-tests-people-ask-about"
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          "name": "Questions to ask before a large panel",
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          "name": "When more testing is not better",
          "url": "https://mainstreetbloodlab.com/articles/routine-blood-tests-preventive-health-optimization.html#when-more-testing-is-not-better"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/routine-blood-tests-preventive-health-optimization.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/routine-blood-tests-preventive-health-optimization.html#related-guides"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/routine-blood-tests-preventive-health-optimization.html#related-guides-heading"
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      "title": "Doctor-ordered vs direct-access vs at-home lab tests",
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      "topic": "blood",
      "topicName": "Blood tests",
      "description": "How to choose safely by test question, specimen, CLIA lab quality, FDA review, follow-up, privacy, and cost.",
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          "name": "MedlinePlus: At-Home Medical Tests",
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          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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          "name": "FDA: Home Use Tests Glossary",
          "url": "https://www.fda.gov/medical-devices/home-use-tests/home-use-tests-glossary"
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          "name": "MedlinePlus: Laboratory Tests",
          "url": "https://medlineplus.gov/laboratorytests.html"
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        {
          "name": "CDC: Getting Tested for STIs",
          "url": "https://www.cdc.gov/sti/testing/index.html"
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        {
          "name": "CDC: Clinical Laboratory Improvement Amendments",
          "url": "https://www.cdc.gov/clia/"
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        {
          "name": "CMS: Clinical Laboratory Improvement Amendments",
          "url": "https://www.cms.gov/medicare/quality/clinical-laboratory-improvement-amendments"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/doctor-ordered-vs-direct-access-at-home-lab-tests.html#short-answer"
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          "name": "Three access paths",
          "url": "https://mainstreetbloodlab.com/articles/doctor-ordered-vs-direct-access-at-home-lab-tests.html#three-access-paths"
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        {
          "name": "What to check before you order",
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          "url": "https://mainstreetbloodlab.com/articles/doctor-ordered-vs-direct-access-at-home-lab-tests.html#good-uses-of-each-path"
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          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/doctor-ordered-vs-direct-access-at-home-lab-tests.html#faq"
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/doctor-ordered-vs-direct-access-at-home-lab-tests.html#related-guides"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/doctor-ordered-vs-direct-access-at-home-lab-tests.html#related-guides-heading"
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          "name": "MedlinePlus Medical Encyclopedia: CBC Blood Test",
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          "name": "NIDDK: Anemia of Inflammation or Chronic Disease",
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          "name": "NCBI Bookshelf: Normal and Abnormal Complete Blood Count With Differential",
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          "name": "MedlinePlus: White Blood Count",
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          "name": "CBC with differential",
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          "name": "How to read patterns",
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          "url": "https://mainstreetbloodlab.com/articles/cbc-blood-test.html#questions-to-ask"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/cbc-blood-test.html#related-guides-heading"
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          "name": "MedlinePlus: Complete Blood Count CBC",
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          "name": "FAQ",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/reticulocyte-count-test.html#related-guides-heading"
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          "url": "https://mainstreetbloodlab.com/articles/peripheral-blood-smear-test.html#short-answer"
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        {
          "name": "What it can add",
          "url": "https://mainstreetbloodlab.com/articles/peripheral-blood-smear-test.html#what-it-can-add"
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        {
          "name": "Common morphology clues",
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          "name": "Limits",
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        {
          "name": "When follow-up matters",
          "url": "https://mainstreetbloodlab.com/articles/peripheral-blood-smear-test.html#when-follow-up-matters"
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/peripheral-blood-smear-test.html#related-guides-heading"
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      "position": 13,
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          "name": "MedlinePlus Medical Encyclopedia: Troponin Test",
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          "name": "American Heart Association: Diagnosing a Heart Attack",
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          "name": "American Heart Association: Warning Signs of a Heart Attack",
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          "name": "NHLBI: Heart Attack Diagnosis",
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        {
          "name": "NHLBI: Heart Attack Symptoms",
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          "name": "Merck Manual Consumer Version: Chest Pain",
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          "name": "American College of Cardiology: 2021 Chest Pain Guideline Perspectives",
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          "name": "High-sensitivity troponin",
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          "name": "What troponin still cannot prove",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/troponin-blood-test.html#faq"
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/troponin-blood-test.html#related-guides-heading"
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      "topic": "blood",
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          "name": "NHLBI: Heart Failure Symptoms",
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          "name": "American Heart Association: Diagnosing Heart Failure",
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          "name": "CDC: About Heart Failure",
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        {
          "name": "2022 AHA/ACC/HFSA Heart Failure Guideline",
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          "name": "When these tests are most useful",
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          "name": "BNP versus NT-proBNP",
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          "name": "How to think about results",
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          "name": "FAQ",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/bnp-nt-probnp-heart-failure-tests.html#related-guides-heading"
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          "name": "MedlinePlus Medical Encyclopedia: ESR",
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          "name": "NHLBI: Vasculitis",
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        {
          "name": "Mayo Clinic: Giant Cell Arteritis Diagnosis and Treatment",
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          "name": "What ESR measures",
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          "name": "Common ESR result patterns",
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        {
          "name": "ESR versus CRP",
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          "url": "https://mainstreetbloodlab.com/articles/erythrocyte-sedimentation-rate-esr-test.html#questions-to-ask"
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          "name": "FAQ",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/erythrocyte-sedimentation-rate-esr-test.html#related-guides-heading"
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      "topic": "blood",
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          "name": "MedlinePlus Medical Encyclopedia: LDH isoenzyme blood test",
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          "name": "NCBI Bookshelf: Biochemistry, Lactate Dehydrogenase",
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          "name": "PubMed: The Biochemical and Clinical Perspectives of Lactate Dehydrogenase",
          "url": "https://pubmed.ncbi.nlm.nih.gov/31886754/"
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          "name": "What LDH-1 through LDH-5 mean",
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        {
          "name": "Why the test is niche now",
          "url": "https://mainstreetbloodlab.com/articles/ldh-isoenzymes-test.html#why-the-test-is-niche-now"
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          "name": "When it still comes up",
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          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/ldh-isoenzymes-test.html#questions-to-ask"
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          "name": "What follow-up may include",
          "url": "https://mainstreetbloodlab.com/articles/ldh-isoenzymes-test.html#what-follow-up-may-include"
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          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/ldh-isoenzymes-test.html#faq"
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ldh-isoenzymes-test.html#related-guides-heading"
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          "name": "CDC: Testing and Diagnosis for Venous Thromboembolism",
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          "name": "CDC: About Venous Thromboembolism",
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          "name": "American Society of Hematology 2018 VTE Diagnosis Guidelines",
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          "name": "ACEP: Acute Venous Thromboembolic Disease Clinical Policy",
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          "url": "https://mainstreetbloodlab.com/articles/d-dimer-blood-test.html#what-the-test-measures"
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        {
          "name": "When it is most useful",
          "url": "https://mainstreetbloodlab.com/articles/d-dimer-blood-test.html#when-it-is-most-useful"
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          "name": "How to think about results",
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          "name": "Why D-dimer can be high without a clot",
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          "name": "When to seek urgent care",
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          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/d-dimer-blood-test.html#questions-to-ask"
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          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/d-dimer-blood-test.html#faq"
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/d-dimer-blood-test.html#related-guides-heading"
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          "name": "NHLBI: Bleeding Disorders Diagnosis",
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          "name": "Warfarin, vitamin K, and medicines",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "MedlinePlus: Bleeding Disorders",
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          "name": "NHLBI: Bleeding Disorders Diagnosis",
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        {
          "name": "Merck Manual Professional Edition: Excessive Bleeding",
          "url": "https://www.merckmanuals.com/professional/hematology-and-oncology/hemostasis/excessive-bleeding"
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        {
          "name": "Mayo Clinic Laboratories: Activated Partial Thromboplastin Time",
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          "name": "FAQ",
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          "name": "FAQ",
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          "name": "FAQ",
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          "name": "CDC: About von Willebrand Disease",
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          "name": "FAQ",
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          "url": "https://mainstreetbloodlab.com/articles/von-willebrand-factor-testing.html#related-guides-heading"
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          "name": "NHLBI: What Are Bleeding Disorders?",
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          "name": "FAQ",
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          "name": "CDC: Testing for Inhibitors and Hemophilia",
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          "url": "https://mainstreetbloodlab.com/articles/mixing-study-blood-test.html#related-guides-heading"
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          "name": "MedlinePlus Genetics: Antiphospholipid Syndrome",
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          "name": "MedlinePlus: Partial Thromboplastin Time",
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          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/factor-viii-inhibitor-testing.html#related-guides-heading"
        }
      ]
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      "position": 27,
      "title": "Thrombin time and reptilase time testing",
      "url": "https://mainstreetbloodlab.com/articles/thrombin-time-reptilase-time-testing.html",
      "topic": "blood",
      "topicName": "Blood tests",
      "description": "Heparin effect, fibrinogen deficiency, dysfibrinogenemia, clot formation, prolonged results, and follow-up tests.",
      "sourceTag": "MedlinePlus + Mayo + Labcorp",
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          "name": "MedlinePlus: Fibrinogen Blood Test",
          "url": "https://medlineplus.gov/ency/article/003650.htm"
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        {
          "name": "Mayo Clinic Laboratories: Reptilase Time, Plasma",
          "url": "https://www.mayocliniclabs.com/test-catalog/Overview/622836"
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        {
          "name": "Mayo Clinic Laboratories: Prolonged Clot Time Profile, Plasma",
          "url": "https://www.mayocliniclabs.com/test-catalog/Overview/603308"
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        {
          "name": "Labcorp: Reptilase Time",
          "url": "https://www.labcorp.com/tests/117180/reptilase-time"
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        {
          "name": "ARUP Consult: Prolonged Clotting Time Evaluation",
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          "name": "MedlinePlus: Prothrombin Time Test and INR",
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          "name": "MedlinePlus: Laboratory Tests",
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          "name": "Pattern clues",
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          "name": "How labs use the tests",
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          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/thrombin-time-reptilase-time-testing.html#related-guides-heading"
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      "topic": "blood",
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      "description": "Rare bleeding, normal PT and aPTT, clot stabilization, wound healing, and FXIII deficiency.",
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          "name": "MedlinePlus: Coagulation Factor Tests",
          "url": "https://medlineplus.gov/lab-tests/coagulation-factor-tests"
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        {
          "name": "MedlinePlus Genetics: Factor XIII Deficiency",
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          "name": "ARUP Consult: Factor XIII Deficiency Testing",
          "url": "https://arupconsult.com/ati/factor-xiii-deficiency-testing"
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          "name": "Mayo Clinic Laboratories: Coagulation Factor XIII (13) Activity Assay, Plasma",
          "url": "https://www.mayocliniclabs.com/test-catalog/Overview/623415"
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        {
          "name": "NHLBI: Bleeding Disorders Diagnosis",
          "url": "https://www.nhlbi.nih.gov/health/bleeding-disorders/diagnosis"
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          "name": "MedlinePlus: Prothrombin Time Test and INR",
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        {
          "name": "Inherited versus acquired deficiency",
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        {
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          "name": "Questions to ask",
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          "name": "What follow-up may include",
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          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/factor-xiii-activity-testing.html#related-guides-heading"
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        {
          "name": "MedlinePlus Genetics: PLG Gene",
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        {
          "name": "MedlinePlus: Bleeding Disorders",
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        {
          "name": "Mayo Clinic Laboratories: Plasminogen Activity, Plasma",
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        {
          "name": "ARUP Laboratories Test Directory: Plasminogen Activity",
          "url": "https://ltd.aruplab.com/Tests/Pub/0030190"
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        {
          "name": "Labcorp: Plasminogen Activity",
          "url": "https://www.labcorp.com/tests/117713/plasminogen-activity"
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        {
          "name": "Labcorp: Plasminogen Antigen",
          "url": "https://www.labcorp.com/tests/117340/plasminogen-antigen"
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          "name": "NCBI Gene: PLG",
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          "name": "PubMed: Plasminogen deficiency",
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        {
          "name": "MedlinePlus: Laboratory Tests",
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        {
          "name": "When the test is ordered",
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          "name": "How to read low activity",
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          "name": "Activity versus antigen",
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        {
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/plasminogen-activity-testing.html#faq"
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        {
          "name": "Related guides",
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        {
          "name": "MedlinePlus Medical Encyclopedia: Fibrinolysis - primary or secondary",
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        {
          "name": "MedlinePlus Bleeding Disorders",
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          "name": "PMC: Measuring fibrinolysis: from research to routine diagnostic assays",
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        {
          "name": "ARUP Laboratories: Plasminogen Activator Inhibitor 1, Activity",
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          "name": "MedlinePlus: Laboratory Tests",
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        {
          "name": "What short or long results can suggest",
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          "name": "Why this is a specialist test",
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          "name": "Questions to ask",
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          "name": "What follow-up may include",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/euglobulin-clot-lysis-time-testing.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/euglobulin-clot-lysis-time-testing.html#related-guides-heading"
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      "title": "Alpha-2 antiplasmin activity testing",
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      "topic": "blood",
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      "description": "SERPINF2, activity versus antigen, delayed bleeding, fibrinolysis, and clot breakdown.",
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      "sources": [
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          "name": "Mayo Clinic Laboratories: Alpha-2 Plasmin Inhibitor, Plasma",
          "url": "https://www.mayocliniclabs.com/test-catalog/Overview/602169"
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        {
          "name": "ARUP Laboratories Test Directory: Alpha-2-Antiplasmin, Activity",
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          "name": "Labcorp: Alpha2-antiplasmin",
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          "name": "NCBI Gene: SERPINF2",
          "url": "https://www.ncbi.nlm.nih.gov/gene/5345"
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        {
          "name": "PMC: Bleeding Disorders in Primary Fibrinolysis",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8268566/"
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          "name": "PubMed: Alpha 2-antiplasmin deficiency. An overlooked cause of hemorrhage",
          "url": "https://pubmed.ncbi.nlm.nih.gov/8328647/"
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        {
          "name": "PMC: Alpha 2-antiplasmin deficiency in a Sudanese child",
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        {
          "name": "When the test is ordered",
          "url": "https://mainstreetbloodlab.com/articles/alpha-2-antiplasmin-activity-testing.html#when-the-test-is-ordered"
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        {
          "name": "How to read low or high activity",
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        {
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          "name": "Why it is not a standard clot panel",
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          "name": "What can distort the result",
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/alpha-2-antiplasmin-activity-testing.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/alpha-2-antiplasmin-activity-testing.html#related-guides-heading"
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      "topic": "blood",
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      "sources": [
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          "url": "https://medlineplus.gov/genetics/condition/complete-plasminogen-activator-inhibitor-1-deficiency/"
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        {
          "name": "GeneReviews: Complete plasminogen activator inhibitor 1 deficiency",
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        {
          "name": "ARUP Laboratories: Plasminogen Activator Inhibitor 1, Activity",
          "url": "https://ltd.aruplab.com/Tests/Pub/0098781"
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        {
          "name": "Mayo Clinic Laboratories: Plasminogen Activator Inhibitor Antigen, Plasma",
          "url": "https://www.mayocliniclabs.com/test-catalog/Overview/PAI1"
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        {
          "name": "ARUP Laboratories: Plasminogen Activator Inhibitor-1, PAI-1 (SERPINE1) Genotyping",
          "url": "https://ltd.aruplab.com/Tests/Pub/2004980"
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        {
          "name": "NCBI Gene: SERPINE1 serpin family E member 1",
          "url": "https://www.ncbi.nlm.nih.gov/gene/5054/"
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        {
          "name": "PMC: Recognition of Plasminogen Activator Inhibitor Type 1 as the Primary Regulator of Fibrinolysis",
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        {
          "name": "When the test is ordered",
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        {
          "name": "How to read low or high activity",
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          "name": "Activity versus antigen",
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/pai-1-activity-testing.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/pai-1-activity-testing.html#related-guides-heading"
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      "title": "Thromboelastography and ROTEM testing",
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      "topic": "blood",
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          "name": "NCBI Bookshelf: Thromboelastography",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK537061/"
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        {
          "name": "NCBI Bookshelf: TEG/ROTEM for Trauma Review",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK513366/"
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        {
          "name": "Viscoelastic Hemostatic Assays: A Primer on Legacy and New Generation Devices",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8836477/"
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          "name": "Viscoelastic testing: an illustrated review of technology and clinical applications",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9903681/"
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          "name": "Thrombelastography (TEG): practical considerations on its clinical use in trauma resuscitation",
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        {
          "name": "Clinical application of viscoelastic point-of-care tests of coagulation-shifting paradigms",
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        {
          "name": "MedlinePlus: Laboratory Tests",
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        {
          "name": "What TEG and ROTEM can show",
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        {
          "name": "When clinicians use it",
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        {
          "name": "Why it is different from PT and aPTT",
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/thromboelastography-rotem-testing.html#questions-to-ask"
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        {
          "name": "What follow-up may include",
          "url": "https://mainstreetbloodlab.com/articles/thromboelastography-rotem-testing.html#what-follow-up-may-include"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/thromboelastography-rotem-testing.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/thromboelastography-rotem-testing.html#related-guides-heading"
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      "position": 34,
      "title": "High platelet count interpretation",
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      "topic": "blood",
      "topicName": "Blood tests",
      "description": "Thrombocytosis, CBC trends, iron deficiency, inflammation, clot questions, and repeat testing.",
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      "sourceCount": 7,
      "sources": [
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          "url": "https://medlineplus.gov/lab-tests/platelet-tests/"
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        {
          "name": "MedlinePlus Medical Encyclopedia: Platelet Count",
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          "name": "NHLBI: Thrombocythemia and Thrombocytosis",
          "url": "https://www.nhlbi.nih.gov/health/thrombocythemia-thrombocytosis"
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        {
          "name": "NHLBI: What Are Platelet Disorders?",
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          "name": "Merck Manual Professional Version: Essential Thrombocythemia",
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          "name": "FAQ",
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          "name": "NCBI Bookshelf: Leukocytosis",
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          "name": "American Family Physician: Evaluation of Patients with Leukocytosis",
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          "name": "CDC: Preventing Infections in Cancer Patients",
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          "name": "MedlinePlus: Complete Blood Count",
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          "name": "Merck Manual Professional Edition: Lymphocytopenia",
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        {
          "name": "NCBI Bookshelf: Peripheral Blood Smear",
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          "name": "What a low lymphocyte count means",
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          "name": "FAQ",
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          "name": "How to frame the result",
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          "name": "Common context",
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          "name": "Questions to ask",
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          "name": "What follow-up may include",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "How to frame the result",
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          "name": "Common context",
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          "name": "Questions to ask",
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          "name": "What follow-up may include",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "FAQ",
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          "name": "FAQ",
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        {
          "name": "What the pattern includes",
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        {
          "name": "How to frame the result",
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        {
          "name": "Common contexts",
          "url": "https://mainstreetbloodlab.com/articles/leukoerythroblastic-blood-smear-interpretation.html#common-contexts"
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          "name": "More concerning patterns",
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        {
          "name": "Follow-up testing",
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          "name": "When follow-up should be urgent",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
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      "position": 84,
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          "name": "MedlinePlus Medical Encyclopedia: Creatine Phosphokinase Test",
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        {
          "name": "MedlinePlus Medical Encyclopedia: Rhabdomyolysis",
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        {
          "name": "CDC/NIOSH: Heat-related Illnesses",
          "url": "https://www.cdc.gov/niosh/heat-stress/about/illnesses.html"
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        {
          "name": "CDC/NIOSH: Rhabdomyolysis and Work",
          "url": "https://www.cdc.gov/niosh/rhabdo/index.html"
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        {
          "name": "Merck Manual Professional Edition: Rhabdomyolysis",
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          "name": "NCBI Bookshelf: Creatine Phosphokinase",
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          "name": "American Heart Association: Diagnosing a Heart Attack",
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          "name": "Common reasons CK is high",
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          "name": "Exercise and timing",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "MedlinePlus: Chronic Pancreatitis",
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          "name": "What high results can mean",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "MedlinePlus: Liver Function Tests",
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          "name": "Common high GGT patterns",
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          "name": "FAQ",
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          "name": "Merck Manual Consumer Version: Liver Blood Tests",
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        {
          "name": "Why AST is less liver-specific than ALT",
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          "name": "Patterns that change the meaning",
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          "name": "What follow-up may clarify",
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        {
          "name": "When high AST needs timely care",
          "url": "https://mainstreetbloodlab.com/articles/ast-blood-test.html#when-high-ast-needs-timely-care"
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          "name": "Questions to ask",
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          "name": "Related guides",
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        {
          "name": "CDC: Hepatitis A Surveillance Guidance",
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          "name": "CDC: Screening and Testing for Hepatitis B Virus Infection, 2023",
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          "name": "Hepatitis B triple panel",
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          "name": "Hepatitis C antibody and RNA",
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          "name": "Timing, symptoms, and liver enzymes",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/hepatitis-a-b-c-blood-tests.html#related-guides-heading"
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      "position": 92,
      "title": "High ferritin with liver enzymes",
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          "name": "What the full iron panel adds",
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          "name": "When follow-up matters most",
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          "name": "What follow-up may include",
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        {
          "name": "FAQ",
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          "name": "Related guides",
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          "name": "AASLD: Why are non-invasive risk scores such as FIB-4 used in clinical practice?",
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          "name": "CDC: Testing for Hepatitis B",
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          "name": "CDC: Hepatitis B Vaccine",
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          "name": "CDC: Hepatitis B Prevention and Control",
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          "name": "CDC: Responding to HBV Exposures in Health Care Settings",
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        {
          "name": "CDC: Guidelines for Perinatal Post-Vaccination Serologic Testing",
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          "name": "CDC MMWR: Screening and Testing for Hepatitis B Virus Infection, 2023",
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        {
          "name": "Common result patterns",
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          "name": "Why timing matters",
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          "name": "Questions to ask",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/hepatitis-b-surface-antibody-after-vaccination.html#related-guides-heading"
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          "name": "MedlinePlus: AFP Test",
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          "name": "MedlinePlus: Quadruple screen test",
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          "name": "What can raise or lower ceruloplasmin",
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          "name": "NIDDK: Chronic Kidney Disease Tests and Diagnosis",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "MedlinePlus: Congenital Adrenal Hyperplasia",
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          "name": "What a high result can mean",
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          "name": "Common reasons prolactin is high",
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          "name": "Why repeat testing is common",
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        {
          "name": "When AMH is most useful",
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          "name": "FAQ",
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        {
          "name": "What phosphorus does",
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        {
          "name": "Why phosphorus may be checked",
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        {
          "name": "High phosphorus patterns",
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        {
          "name": "Low phosphorus patterns",
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        {
          "name": "What can affect interpretation",
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          "name": "When follow-up may be urgent",
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/phosphorus-blood-test.html#questions-to-ask"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/phosphorus-blood-test.html#related-guides-heading"
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      "position": 114,
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          "name": "MedlinePlus: Hypoparathyroidism",
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          "name": "NIDDK: Primary Hyperparathyroidism",
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        {
          "name": "NIDDK: Mineral & Bone Disorder in Chronic Kidney Disease",
          "url": "https://www.niddk.nih.gov/health-information/kidney-disease/mineral-bone-disorder"
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          "name": "NIH Office of Dietary Supplements: Vitamin D Consumer Fact Sheet",
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        {
          "name": "NIH Office of Dietary Supplements: Calcium Consumer Fact Sheet",
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        {
          "name": "What other tests help",
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        {
          "name": "When PTH is hard to read",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "MedlinePlus Medical Encyclopedia: Leukocyte Esterase Urine Test",
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          "name": "MedlinePlus: Blood in Urine",
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          "name": "MedlinePlus: Protein in Urine",
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          "name": "MedlinePlus: Glucose in Urine Test",
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          "name": "MedlinePlus: Ketones in Urine",
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          "name": "NIDDK: Chronic Kidney Disease Tests and Diagnosis",
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        {
          "name": "CDC: Urinary Tract Infection Basics",
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          "name": "American Urological Association: Microhematuria Guideline",
          "url": "https://www.auanet.org/guidelines-and-quality/guidelines/microhematuria"
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          "name": "NIDDK: Hematuria (Blood in the Urine)",
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        {
          "name": "NCBI Bookshelf: Urine Culture",
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        {
          "name": "MedlinePlus Medical Encyclopedia: Urine Culture",
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          "name": "When to follow up urgently",
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          "name": "Questions to ask",
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        {
          "name": "Related guides",
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          "name": "MedlinePlus: Microalbumin Creatinine Ratio",
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        {
          "name": "MedlinePlus Medical Encyclopedia: Microalbuminuria Test",
          "url": "https://medlineplus.gov/ency/article/003591.htm"
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        {
          "name": "NIDDK: Albuminuria: Albumin in the Urine",
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          "name": "NIDDK: Chronic Kidney Disease Tests and Diagnosis",
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          "name": "NIDDK: Assess Urine Albumin",
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        {
          "name": "CDC: Testing for Chronic Kidney Disease",
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        {
          "name": "National Kidney Foundation: UACR",
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        {
          "name": "Result ranges and what they can mean",
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        {
          "name": "What can affect UACR",
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          "name": "Who is usually screened",
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          "name": "Questions to ask",
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          "name": "Frequently asked questions",
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          "name": "Related guides",
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      "topic": "blood",
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      "description": "UTI bacteria, clean-catch samples, colony growth, antibiotic susceptibility, contamination, and follow-up.",
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          "name": "MedlinePlus: Urinary Tract Infections",
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        {
          "name": "CDC: Urinary Tract Infection Basics",
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        {
          "name": "CDC: Catheter-associated Urinary Tract Infection Basics",
          "url": "https://www.cdc.gov/uti/about/cauti-basics.html"
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        {
          "name": "NCBI Bookshelf: Urine Culture",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557569/"
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        {
          "name": "NCBI Bookshelf: In brief: Understanding urine tests",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK279350/"
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        {
          "name": "ACOG: Urinary Tract Infections in Pregnant Individuals",
          "url": "https://www.acog.org/clinical/clinical-guidance/clinical-consensus/articles/2023/08/urinary-tract-infections-in-pregnant-individuals"
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          "name": "When clinicians order it",
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        {
          "name": "What the report may include",
          "url": "https://mainstreetbloodlab.com/articles/urine-culture-test.html#what-the-report-may-include"
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        {
          "name": "Collection and contamination",
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          "name": "MedlinePlus: Potassium Blood Test",
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          "name": "MedlinePlus: Chloride Blood Test",
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          "name": "MedlinePlus: Carbon Dioxide in Blood",
          "url": "https://medlineplus.gov/lab-tests/carbon-dioxide-co2-in-blood/"
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          "name": "MedlinePlus: Anion Gap Blood Test",
          "url": "https://medlineplus.gov/lab-tests/anion-gap-blood-test/"
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          "name": "National Kidney Foundation: Understanding Your Lab Values and Other CKD Health Numbers",
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          "name": "Anion gap and CO2/bicarbonate context",
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        {
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          "name": "Related guides",
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          "name": "NIDDK: Nephrotic Syndrome in Adults",
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        {
          "name": "CDC: Testing for Chronic Kidney Disease",
          "url": "https://www.cdc.gov/kidney-disease/testing/index.html"
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        {
          "name": "National Kidney Foundation: Urine Albumin-Creatinine Ratio",
          "url": "https://www.kidney.org/kidney-failure-risk-factor-urine-albumin-creatinine-ratio-uacr"
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        {
          "name": "NCBI Bookshelf: Hypoalbuminemia",
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          "name": "MedlinePlus: Laboratory Tests",
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          "name": "What can affect UPCR",
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          "name": "What cystatin C may add",
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          "name": "FDA: First Chlamydia and Gonorrhea Test with At-Home Sample Collection",
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          "name": "FDA: Marketing Authorization for First At-Home Syphilis Test",
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          "name": "MedlinePlus: Laboratory Tests",
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          "name": "CDC: How to Prevent STIs",
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          "name": "CDC: STI Treatment Guidelines",
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          "name": "CDC: About Sexually Transmitted Infections (STIs)",
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          "name": "CDC: Screening for Genital Herpes",
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        {
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          "name": "CDC: Urethritis and Cervicitis Guidelines",
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          "name": "CDC: Vulvovaginal Symptoms Guidelines",
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        {
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          "name": "Body site and sample type matter",
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          "name": "Related Lab Intel guides",
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          "name": "Related guides",
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      "topic": "sti",
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        {
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        {
          "name": "What to test for",
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        {
          "name": "When to test and when to repeat",
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        {
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          "name": "Questions to ask a clinic",
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        {
          "name": "Related Lab Intel guides",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/sti-testing-after-travel-sex.html#related-guides-heading"
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    {
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        {
          "name": "CDC: Getting Tested for STIs",
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        {
          "name": "CDC: STI Screening Recommendations",
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        {
          "name": "CDC: Getting Tested for HIV",
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        {
          "name": "CDC: Clinical Guidance for PrEP",
          "url": "https://www.cdc.gov/hivnexus/hcp/prep/index.html"
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        {
          "name": "CDC: Condom Use Overview",
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        {
          "name": "CDC: Contraception and Birth Control Methods",
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          "name": "Use testing as one part of a safer-sex agreement",
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        {
          "name": "What a practical testing plan may include",
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          "name": "Timing and window periods",
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          "name": "Pregnancy prevention is a separate question",
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        {
          "name": "Questions to ask each other",
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        {
          "name": "Questions to ask a clinic",
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        {
          "name": "Related Lab Intel guides",
          "url": "https://mainstreetbloodlab.com/articles/sti-testing-before-stopping-condoms.html#related-lab-intel-guides"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/sti-testing-before-stopping-condoms.html#related-guides-heading"
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      "position": 150,
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        {
          "name": "CDC: How to Prevent STIs",
          "url": "https://www.cdc.gov/sti/prevention/index.html"
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        {
          "name": "CDC: Guide to Taking a Sexual History",
          "url": "https://www.cdc.gov/sti/hcp/clinical-guidance/taking-a-sexual-history.html"
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        {
          "name": "CDC: STI Screening Recommendations",
          "url": "https://www.cdc.gov/std/treatment-guidelines/screening-recommendations.htm"
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        {
          "name": "CDC: STI and HIV Infection Risk Assessment",
          "url": "https://www.cdc.gov/std/treatment-guidelines/clinical-risk.htm"
        },
        {
          "name": "CDC: Doxy PEP for Bacterial STI Prevention",
          "url": "https://www.cdc.gov/sti/hcp/doxy-pep/index.html"
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        {
          "name": "CDC: Primary Prevention Methods",
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        {
          "name": "Build the plan around exposure, not labels",
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        {
          "name": "How often to test",
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        {
          "name": "What to include in a recurring screen",
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        {
          "name": "Body sites matter more with varied partners",
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          "name": "Symptoms and partner results override the routine schedule",
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        {
          "name": "Prevention tools to discuss",
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        {
          "name": "Privacy and result sharing",
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          "name": "Questions for partners",
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        {
          "name": "Related Lab Intel guides",
          "url": "https://mainstreetbloodlab.com/articles/sti-testing-open-relationship-multiple-partners.html#related-lab-intel-guides"
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        {
          "name": "Related guides",
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      "position": 151,
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        {
          "name": "CDC: Preventing HIV with Condoms",
          "url": "https://www.cdc.gov/hiv/prevention/condoms.html"
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        {
          "name": "CDC HIV Risk Reduction Tool",
          "url": "https://hivrisk.cdc.gov/can-i-get-or-transmit-hiv-from/?mid=oral-sex-3"
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        {
          "name": "CDC: Women Who Have Sex with Women Guidelines",
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        {
          "name": "CDC: How to Prevent STIs",
          "url": "https://www.cdc.gov/sti/prevention/index.html"
        },
        {
          "name": "CDC: Getting Tested for STIs",
          "url": "https://www.cdc.gov/sti/testing/index.html"
        },
        {
          "name": "CDC: About STI Risk and Oral Sex",
          "url": "https://www.cdc.gov/sti/about/about-sti-risk-and-oral-sex.html"
        },
        {
          "name": "CDC: About Bacterial Vaginosis",
          "url": "https://www.cdc.gov/bacterial-vaginosis/about/index.html"
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        {
          "name": "CDC: STI Treatment Guidelines",
          "url": "https://www.cdc.gov/mmwr/volumes/70/rr/RR7004a1.htm"
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        {
          "name": "CDC: STI Screening Recommendations",
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        {
          "name": "CDC: How to Prevent STIs",
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        {
          "name": "HIV anxiety after sharing sex toys",
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          "name": "Body-site testing matters",
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          "name": "Questions to ask a clinic",
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        {
          "name": "Related Lab Intel guides",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/sti-testing-after-sharing-sex-toys.html#related-guides-heading"
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        {
          "name": "CDC: How HIV Spreads",
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        {
          "name": "CDC: About Genital Herpes",
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        {
          "name": "CDC: About Genital HPV Infection",
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        {
          "name": "CDC: Women Who Have Sex with Women Guidelines",
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        {
          "name": "CDC: How to Prevent STIs",
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        {
          "name": "CDC: Getting Tested for STIs",
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        {
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          "name": "What testing might be discussed",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/sti-testing-after-genital-touching-fingering.html#related-guides-heading"
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        {
          "name": "CDC HIV Risk Reduction Tool: Touching",
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        {
          "name": "CDC: How HIV Spreads",
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        {
          "name": "CDC: How to Prevent STIs",
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        {
          "name": "CDC: Getting Tested for STIs",
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        {
          "name": "CDC: Genital Herpes Treatment Guidelines",
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          "name": "CDC: STI Treatment Guidelines",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/sti-testing-after-dry-humping-genital-rubbing.html#related-guides-heading"
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          "name": "HIV.gov: How Is HIV Transmitted?",
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        {
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        {
          "name": "CDC: How to Prevent STIs",
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          "url": "https://www.cdc.gov/std/treatment-guidelines/chlamydia.htm"
        },
        {
          "name": "CDC: Gonococcal Infections Treatment Guidelines",
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        {
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        {
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        {
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        {
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        {
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        {
          "name": "Related Lab Intel guides",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/partner-notification-ept-sti.html#related-guides-heading"
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          "name": "Related guides",
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          "name": "CMS: How to Read an Explanation of Benefits",
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        {
          "name": "Related Lab Intel guides",
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        {
          "name": "Related guides",
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        {
          "name": "CDC: STI Screening Recommendations",
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        {
          "name": "CDC: Screening for Genital Herpes",
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        {
          "name": "CDC: Trichomoniasis Treatment Guidelines",
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        {
          "name": "CDC: Screening for Cervical Cancer",
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        {
          "name": "CDC: Mycoplasma genitalium Treatment Guidelines",
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          "name": "CDC: Vulvovaginal Symptoms Guidelines",
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        {
          "name": "CDC: STI Treatment Guidelines",
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        {
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        {
          "name": "CDC: Getting Tested for STIs",
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        {
          "name": "CDC: STI Screening Recommendations",
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          "name": "CDC: How to Prevent STIs",
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        {
          "name": "CDC: Getting Tested for HIV",
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        {
          "name": "CDC: Chlamydial Infections",
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        {
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        {
          "name": "CDC: Syphilis",
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        {
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        {
          "name": "CDC: STI and HIV Infection Risk Assessment",
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        {
          "name": "CDC GetTested",
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        {
          "name": "MedlinePlus: Laboratory Tests",
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        {
          "name": "CDC: STI Treatment Guidelines",
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        {
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        {
          "name": "CDC: Sexually Transmitted Infections (STIs)",
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          "name": "CDC: STI Treatment Guidelines for Pregnant Women",
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          "name": "CDC: Doxy PEP for Bacterial STI Prevention",
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          "name": "CDC MMWR: Doxycycline Postexposure Prophylaxis Guidelines, 2024",
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          "name": "CDC: Getting Tested for STIs",
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          "name": "Follow-up testing is part of doxyPEP care",
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          "name": "Body-site testing still counts",
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          "name": "Where to ask about it",
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          "name": "CDC: Preventing HIV with PrEP",
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          "name": "CDC: Clinical Testing Guidance for HIV",
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          "name": "CDC STI Guidelines: HIV",
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          "name": "Related guides",
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        {
          "name": "CDC: Updated Guidelines for Antiretroviral Postexposure Prophylaxis",
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          "name": "CDC: Clinical Guidance for PrEP",
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        {
          "name": "CDC: Clinical Testing Guidance for HIV",
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          "name": "CDC: Getting Tested for STIs",
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        {
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        {
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        {
          "name": "Related guides",
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        {
          "name": "CDC: STI Screening Recommendations",
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          "name": "CDC: Chlamydial Infections Treatment Guidelines",
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          "name": "CDC: Gonococcal Infections Treatment Guidelines",
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        {
          "name": "CDC: Men Who Have Sex with Men Guidelines",
          "url": "https://www.cdc.gov/std/treatment-guidelines/msm.htm"
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        {
          "name": "CDC: Next Steps After Testing Positive for Gonorrhea or Chlamydia",
          "url": "https://www.cdc.gov/sti/testing/next-steps-after-testing-positive-for-gonorrhea-or-chlamydia.html"
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        {
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          "name": "Screening guidance depends on the person and site",
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          "name": "Why throat gonorrhea gets special attention",
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        {
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          "name": "Related Lab Intel guides",
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          "name": "Related guides",
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        {
          "name": "CDC: Clinical Testing and Diagnosis for Hepatitis B",
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          "name": "CDC STI Guidelines: Hepatitis B Virus Infection",
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          "name": "CDC STI Guidelines: Hepatitis C Virus Infection",
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        {
          "name": "MedlinePlus: Hepatitis Testing",
          "url": "https://medlineplus.gov/lab-tests/hepatitis-testing/"
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        {
          "name": "MedlinePlus: Sexually Transmitted Infection (STI) Tests",
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        {
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        {
          "name": "Why hepatitis C testing often has two steps",
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          "name": "Related Lab Intel guides",
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          "name": "Related guides",
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          "name": "CDC: About Trichomoniasis",
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          "name": "CDC: Vulvovaginal Symptoms Guidelines",
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          "name": "CDC STI Guidelines: HIV Infection",
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        {
          "name": "CDC: Getting Tested for STIs",
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          "name": "CDC: Next Steps After Testing Positive for Gonorrhea or Chlamydia",
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        {
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          "name": "CDC: Urethritis and Cervicitis Guidelines",
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          "name": "CDC: Pelvic Inflammatory Disease Treatment Guidelines",
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          "name": "CDC: STI Treatment Guidelines",
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          "name": "CDC: Summary of STI Treatment Guidelines Wall Chart",
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        {
          "name": "Hologic: Aptima Mycoplasma genitalium Assay Package Insert",
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          "name": "What to separate",
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          "name": "When testing may matter",
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          "name": "MedlinePlus Genetics: What do the results of genetic tests mean?",
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        {
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          "name": "ACG: Management of Crohn's Disease in Adults",
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          "name": "MedlinePlus: Genetic Testing",
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          "name": "MedlinePlus Genetics: Alzheimer's Disease",
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          "name": "National Institute on Aging: What Happens to the Brain in Alzheimer's Disease?",
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          "name": "MedlinePlus: Genetic Counseling",
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          "name": "Related guides",
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          "name": "FDA: Table of Pharmacogenetic Associations",
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          "url": "https://mainstreetbloodlab.com/articles/hla-b27-blood-test.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/hla-b27-blood-test.html#related-guides-heading"
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      "position": 230,
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      "url": "https://mainstreetbloodlab.com/articles/mthfr-genetic-testing-claims.html",
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        {
          "name": "MedlinePlus: MTHFR Mutation Test",
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        {
          "name": "MedlinePlus Genetics: Interpreting Genetic Test Results",
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          "name": "ACMG Practice Guideline: Lack of Evidence for MTHFR Testing",
          "url": "https://pubmed.ncbi.nlm.nih.gov/23288205/"
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          "name": "NIH Genetic Testing Registry: MTHFR thermolabile polymorphism",
          "url": "https://www.ncbi.nlm.nih.gov/gtr/conditions/C1856059"
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        {
          "name": "A call to action: MTHFR polymorphisms should not be a part of inherited thrombophilia testing",
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        {
          "name": "MedlinePlus: Homocysteine Test",
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          "name": "MedlinePlus: Vitamin B12 level",
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          "name": "MedlinePlus: Genetic Counseling",
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          "name": "MedlinePlus Genetics: How Genetic Testing Is Done",
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        {
          "name": "Claims to separate",
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          "name": "What to check instead",
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          "name": "Questions to ask",
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          "name": "FAQ",
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        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/mthfr-genetic-testing-claims.html#related-guides-heading"
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      "position": 231,
      "title": "HLA celiac genetic testing",
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      "topic": "genetics",
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          "name": "NIDDK: Diagnosis of Celiac Disease",
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        {
          "name": "NIDDK: Celiac Disease Tests for Health Care Professionals",
          "url": "https://www.niddk.nih.gov/health-information/professionals/clinical-tools-patient-management/digestive-diseases/celiac-disease-health-care-professionals"
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          "name": "MedlinePlus: Celiac Disease Screening",
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        {
          "name": "MedlinePlus: Celiac Disease",
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          "name": "MedlinePlus Genetics: Celiac disease",
          "url": "https://medlineplus.gov/genetics/condition/celiac-disease/"
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        {
          "name": "NIDDK: Celiac Disease Symptoms and Causes",
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        {
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          "url": "https://mainstreetbloodlab.com/articles/hla-celiac-genetic-testing.html#when-hla-testing-helps"
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        {
          "name": "What each result means",
          "url": "https://mainstreetbloodlab.com/articles/hla-celiac-genetic-testing.html#what-each-result-means"
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        {
          "name": "Why the gluten question still matters",
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        {
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        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/hla-celiac-genetic-testing.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/hla-celiac-genetic-testing.html#related-guides-heading"
        }
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      "position": 232,
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      "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html",
      "topic": "genetics",
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        {
          "name": "MedlinePlus Genetics: Factor V Leiden Thrombophilia",
          "url": "https://medlineplus.gov/genetics/condition/factor-v-leiden-thrombophilia/"
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        {
          "name": "MedlinePlus Genetics: F5 gene",
          "url": "https://medlineplus.gov/genetics/gene/f5/"
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        {
          "name": "GeneReviews: Factor V Leiden Thrombophilia",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK1368/"
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        {
          "name": "ASH: VTE Guidelines on Thrombophilia Testing",
          "url": "https://www.hematology.org/education/clinicians/guidelines-and-quality-care/clinical-practice-guidelines/venous-thromboembolism-guidelines/thrombophilia"
        },
        {
          "name": "CDC: Risk Factors for Blood Clots",
          "url": "https://www.cdc.gov/blood-clots/risk-factors/index.html"
        },
        {
          "name": "CDC: Appendix D Classifications for Combined Hormonal Contraceptives",
          "url": "https://www.cdc.gov/contraception/hcp/usmec/combined-hormonal-contraceptives.html"
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        {
          "name": "MedlinePlus Genetics: What Genetic Test Results Mean",
          "url": "https://medlineplus.gov/genetics/understanding/testing/interpretingresults/"
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          "name": "Short answer",
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        {
          "name": "What the test measures",
          "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html#what-the-test-measures"
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        {
          "name": "When testing is useful",
          "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html#when-testing-is-useful"
        },
        {
          "name": "When routine screening is not the move",
          "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html#when-routine-screening-is-not-the-move"
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        {
          "name": "What a positive or negative result means",
          "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html#what-a-positive-or-negative-result-means"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html#faq-heading"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/factor-v-leiden-testing.html#related-guides-heading"
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    {
      "position": 233,
      "title": "Prothrombin G20210A testing",
      "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html",
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      "topicName": "Genetics",
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        {
          "name": "GeneReviews: Prothrombin Thrombophilia",
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        {
          "name": "ASH: VTE Guidelines on Thrombophilia Testing",
          "url": "https://www.hematology.org/education/clinicians/guidelines-and-quality-care/clinical-practice-guidelines/venous-thromboembolism-guidelines/thrombophilia"
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        {
          "name": "MedlinePlus: Blood Clots",
          "url": "https://medlineplus.gov/bloodclots.html"
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        {
          "name": "Testing for thrombophilia: an evidence-based approach",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC2660493/"
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        {
          "name": "Hereditary thrombophilia",
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        {
          "name": "MedlinePlus Genetics: What do the results of genetic tests mean?",
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        {
          "name": "MedlinePlus: Genetic Testing",
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        {
          "name": "MedlinePlus: Genetic Counseling",
          "url": "https://medlineplus.gov/geneticcounseling.html"
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        {
          "name": "MedlinePlus Genetics: How Genetic Testing Is Done",
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#short-answer"
        },
        {
          "name": "How to frame the result",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#how-to-frame-the-result"
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        {
          "name": "When testing is considered",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#when-testing-is-considered"
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        {
          "name": "What testing should not be used for",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#what-testing-should-not-be-used-for"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#questions-to-ask"
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          "name": "When interpretation needs context",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#when-interpretation-needs-context"
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          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/prothrombin-g20210a-testing.html#related-guides-heading"
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    {
      "position": 234,
      "title": "Protein C, protein S, and antithrombin testing",
      "url": "https://mainstreetbloodlab.com/articles/protein-c-protein-s-antithrombin-testing.html",
      "topic": "genetics",
      "topicName": "Genetics",
      "description": "Inherited and acquired thrombophilia, timing after thrombosis, anticoagulants, repeat testing, and family risk.",
      "sourceTag": "ASH + MedlinePlus + ARUP",
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          "name": "MedlinePlus: Protein C and Protein S Tests",
          "url": "https://medlineplus.gov/lab-tests/protein-c-and-protein-s-tests/"
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        {
          "name": "MedlinePlus Genetics: Protein C deficiency",
          "url": "https://medlineplus.gov/genetics/condition/protein-c-deficiency/"
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          "name": "MedlinePlus Genetics: Protein S deficiency",
          "url": "https://medlineplus.gov/genetics/condition/protein-s-deficiency/"
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          "name": "MedlinePlus Genetics: Hereditary Antithrombin Deficiency",
          "url": "https://medlineplus.gov/genetics/condition/hereditary-antithrombin-deficiency/"
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        {
          "name": "ASH: VTE Guidelines on Thrombophilia Testing",
          "url": "https://www.hematology.org/education/clinicians/guidelines-and-quality-care/clinical-practice-guidelines/venous-thromboembolism-guidelines/thrombophilia"
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        {
          "name": "ARUP Consult: Hereditary Thrombophilia - Hypercoagulability",
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        {
          "name": "MedlinePlus Genetics: What Genetic Test Results Mean",
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          "name": "Short answer",
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        {
          "name": "What each test measures",
          "url": "https://mainstreetbloodlab.com/articles/protein-c-protein-s-antithrombin-testing.html#what-each-test-measures"
        },
        {
          "name": "When testing helps",
          "url": "https://mainstreetbloodlab.com/articles/protein-c-protein-s-antithrombin-testing.html#when-testing-helps"
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        {
          "name": "What can distort results",
          "url": "https://mainstreetbloodlab.com/articles/protein-c-protein-s-antithrombin-testing.html#what-can-distort-results"
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        {
          "name": "What a low result can mean",
          "url": "https://mainstreetbloodlab.com/articles/protein-c-protein-s-antithrombin-testing.html#what-a-low-result-can-mean"
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/protein-c-protein-s-antithrombin-testing.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/protein-c-protein-s-antithrombin-testing.html#related-guides-heading"
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      "position": 235,
      "title": "Antiphospholipid syndrome antibody testing",
      "url": "https://mainstreetbloodlab.com/articles/antiphospholipid-syndrome-antibody-testing.html",
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      "topicName": "Genetics",
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          "name": "MedlinePlus Genetics: Antiphospholipid Syndrome",
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        {
          "name": "MedlinePlus: Antiphospholipid Syndrome",
          "url": "https://medlineplus.gov/ency/article/000547.htm"
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          "name": "NHLBI: Antiphospholipid Syndrome",
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        {
          "name": "ACOG: Antiphospholipid Syndrome",
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        {
          "name": "ACOG: Repeated Miscarriages",
          "url": "https://www.acog.org/womens-health/faqs/gynecologic-problems/repeated-miscarriages"
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        {
          "name": "Blood: How We Diagnose the Antiphospholipid Syndrome",
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        {
          "name": "MedlinePlus Genetics: What Genetic Test Results Mean",
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          "name": "Short answer",
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        {
          "name": "Which antibodies are tested",
          "url": "https://mainstreetbloodlab.com/articles/antiphospholipid-syndrome-antibody-testing.html#which-antibodies-are-tested"
        },
        {
          "name": "What a positive result can and cannot mean",
          "url": "https://mainstreetbloodlab.com/articles/antiphospholipid-syndrome-antibody-testing.html#what-a-positive-result-can-and-cannot-mean"
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        {
          "name": "Why repeat testing matters",
          "url": "https://mainstreetbloodlab.com/articles/antiphospholipid-syndrome-antibody-testing.html#why-repeat-testing-matters"
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        {
          "name": "When to ask about APS testing",
          "url": "https://mainstreetbloodlab.com/articles/antiphospholipid-syndrome-antibody-testing.html#when-to-ask-about-aps-testing"
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/antiphospholipid-syndrome-antibody-testing.html#related-guides-heading"
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    {
      "position": 236,
      "title": "JAK2 testing for unexplained clots",
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      "sources": [
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        {
          "name": "MedlinePlus Genetics: Polycythemia vera",
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        {
          "name": "MedlinePlus Genetics: Essential thrombocythemia",
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          "name": "MedlinePlus Genetics: Primary myelofibrosis",
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          "name": "ARUP Consult: Myeloproliferative neoplasms",
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        {
          "name": "NCI PDQ: Myeloproliferative neoplasms treatment",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK65852/"
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        {
          "name": "MedlinePlus Genetics: What Genetic Test Results Mean",
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          "name": "Short answer",
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        {
          "name": "When JAK2 testing may fit",
          "url": "https://mainstreetbloodlab.com/articles/jak2-testing-unexplained-clots.html#when-jak2-testing-may-fit"
        },
        {
          "name": "What a positive result means",
          "url": "https://mainstreetbloodlab.com/articles/jak2-testing-unexplained-clots.html#what-a-positive-result-means"
        },
        {
          "name": "What a negative result means",
          "url": "https://mainstreetbloodlab.com/articles/jak2-testing-unexplained-clots.html#what-a-negative-result-means"
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        {
          "name": "Common follow-up tests",
          "url": "https://mainstreetbloodlab.com/articles/jak2-testing-unexplained-clots.html#common-follow-up-tests"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/jak2-testing-unexplained-clots.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/jak2-testing-unexplained-clots.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/jak2-testing-unexplained-clots.html#related-guides-heading"
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    {
      "position": 237,
      "title": "CALR and MPL testing for MPNs",
      "url": "https://mainstreetbloodlab.com/articles/calr-mpl-testing-myeloproliferative-neoplasms.html",
      "topic": "genetics",
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      "description": "JAK2 reflex panels, persistent thrombocytosis, ET, PMF, CBC clues, and hematology follow-up.",
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        {
          "name": "Mayo Clinic Laboratories: Myeloproliferative Neoplasm, JAK2 V617F with Reflex to CALR and MPL, Varies",
          "url": "https://www.mayocliniclabs.com/test-catalog/overview/63031"
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        {
          "name": "ARUP Consult: Myeloproliferative Neoplasms",
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        {
          "name": "MedlinePlus Genetics: CALR Gene",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/vhl-genetic-testing.html#related-guides-heading"
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          "name": "FAQ",
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          "url": "https://mainstreetbloodlab.com/articles/nf1-pheochromocytoma-genetic-testing.html#related-guides-heading"
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/men2-surveillance-after-positive-ret-testing.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/men2-surveillance-after-positive-ret-testing.html#related-guides-heading"
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          "name": "MedlinePlus: Genetic Counseling",
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        {
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        {
          "name": "How to read results",
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-v804m-variant-interpretation.html#related-guides-heading"
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        {
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          "url": "https://www.cancer.gov/types/multiple-endocrine-neoplasia/men-type-2-childhood"
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        {
          "name": "How to frame the result",
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        {
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        {
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          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-codon-918-men2b-questions.html#related-guides-heading"
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          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/ret-codon-634-men2a-questions.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-codon-634-men2a-questions.html#related-guides-heading"
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          "name": "MedlinePlus Genetics: What do the results of genetic tests mean?",
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        {
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        {
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        {
          "name": "FAQ",
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          "name": "FAQ",
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        {
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
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      "title": "RET C609Y and C618R report questions",
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          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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        {
          "name": "NCI: Childhood Multiple Endocrine Neoplasia Type 2 Treatment",
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          "name": "How to frame the report",
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        {
          "name": "Why exact notation matters",
          "url": "https://mainstreetbloodlab.com/articles/ret-c609y-c618r-report-questions.html#why-exact-notation-matters"
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        {
          "name": "What the result can change",
          "url": "https://mainstreetbloodlab.com/articles/ret-c609y-c618r-report-questions.html#what-the-result-can-change"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/ret-c609y-c618r-report-questions.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/ret-c609y-c618r-report-questions.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-c609y-c618r-report-questions.html#related-guides-heading"
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    {
      "position": 287,
      "title": "RET cascade testing for children questions",
      "url": "https://mainstreetbloodlab.com/articles/ret-cascade-testing-children-questions.html",
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        {
          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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        {
          "name": "NCI: Childhood MEN2 Syndrome",
          "url": "https://www.cancer.gov/types/multiple-endocrine-neoplasia/men-type-2-childhood"
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        {
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          "name": "MedlinePlus Genetics: Interpreting Genetic Test Results",
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          "name": "ATA: Revised American Thyroid Association Guidelines for the Management of Medullary Thyroid Carcinoma",
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          "name": "NCI: Medullary Thyroid Cancer",
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          "name": "When children and timing matter",
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          "name": "How to read results",
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          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/ret-cascade-testing-children-questions.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/ret-cascade-testing-children-questions.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-cascade-testing-children-questions.html#related-guides-heading"
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      "position": 288,
      "title": "RET calcitonin follow-up after positive genetic testing",
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        {
          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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          "name": "MedlinePlus: Tumor Marker Tests",
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          "name": "MedlinePlus Genetics: Interpreting Genetic Test Results",
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          "name": "NCI: Thyroid Cancer Treatment (PDQ)",
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        {
          "name": "How calcitonin fits",
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        {
          "name": "What the result can and cannot show",
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        {
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/ret-calcitonin-follow-up-after-positive-genetic-testing.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/ret-calcitonin-follow-up-after-positive-genetic-testing.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-calcitonin-follow-up-after-positive-genetic-testing.html#related-guides-heading"
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      "position": 289,
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          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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        {
          "name": "NCI: Childhood Multiple Endocrine Neoplasia Type 2 Treatment",
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        {
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        {
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-family-letter-questions.html#related-guides-heading"
        }
      ]
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      "position": 290,
      "title": "RET de novo variant questions",
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          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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        {
          "name": "NCI: Childhood Multiple Endocrine Neoplasia Type 2 Treatment",
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        {
          "name": "MedlinePlus Genetics: What is a gene variant and how do variants occur?",
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          "name": "MedlinePlus Genetics: Interpreting genetic test results",
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          "name": "NHGRI: Mosaicism",
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          "name": "NCI: Medullary Thyroid Cancer",
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        {
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-de-novo-variant-questions.html#related-guides-heading"
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      ]
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      "position": 291,
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        {
          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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        {
          "name": "NCI: Genetic Testing for Inherited Cancer Risk",
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        {
          "name": "MedlinePlus Genetics: Interpreting Genetic Test Results",
          "url": "https://medlineplus.gov/genetics/understanding/testing/interpretingresults/"
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        {
          "name": "MedlinePlus Genetics: Help Me Understand Genetics",
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        {
          "name": "MedlinePlus Genetics: Multiple Endocrine Neoplasia",
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        {
          "name": "NCI: Medullary Thyroid Cancer",
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          "name": "Questions to ask",
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          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-vus-family-testing-questions.html#related-guides-heading"
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      ]
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      "position": 292,
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        {
          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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        {
          "name": "MedlinePlus Genetics: What is a gene variant and how do variants occur?",
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        {
          "name": "MedlinePlus Genetics: Interpreting genetic test results",
          "url": "https://medlineplus.gov/genetics/understanding/testing/interpretingresults/"
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        {
          "name": "NHGRI: Mosaicism",
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        {
          "name": "MedlinePlus Medical Encyclopedia: Mosaicism",
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        {
          "name": "MedlinePlus: Genetic Testing",
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        {
          "name": "Why sample type matters",
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        {
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          "name": "FAQ",
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        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-mosaicism-questions.html#related-guides-heading"
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        {
          "name": "NCI: Multiple Endocrine Neoplasia Type 2 (PDQ)",
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        {
          "name": "NCI: Biomarker Testing for Cancer Treatment",
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        {
          "name": "NCI: Genetic Testing for Inherited Cancer Risk",
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        {
          "name": "MedlinePlus Genetics: How Genetic Testing Is Done",
          "url": "https://medlineplus.gov/genetics/understanding/testing/procedure/"
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        {
          "name": "MedlinePlus Genetics: Interpreting Genetic Test Results",
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        {
          "name": "NCI: Medullary Thyroid Cancer",
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          "name": "Why sample type matters",
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        {
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        {
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/ret-tumor-only-vs-germline-follow-up.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/ret-tumor-only-vs-germline-follow-up.html#related-guides-heading"
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      ]
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      "position": 294,
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      "url": "https://mainstreetbloodlab.com/articles/ret-allele-fraction-questions.html",
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          "name": "GeneReviews: Multiple Endocrine Neoplasia Type 2",
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        {
          "name": "NCI: Biomarker Testing for Cancer Treatment",
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        {
          "name": "NCI: Genetic Testing for Inherited Cancer Risk",
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          "name": "MedlinePlus Genetics: Interpreting Genetic Test Results",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "MedlinePlus Genetics: How Genetic Testing Is Done",
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          "name": "MedlinePlus Genetics: Interpreting genetic test results",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
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        {
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          "name": "NCBI Bookshelf: Multiple Endocrine Neoplasias Type 2",
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          "name": "NCI: Genetic Testing Fact Sheet",
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          "name": "FAQ",
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          "name": "Related guides",
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        {
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          "name": "MedlinePlus Genetics: How Genetic Testing Is Done",
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          "name": "MedlinePlus Genetics: Genetic Consultation",
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          "name": "NCBI Bookshelf: Multiple Endocrine Neoplasias Type 2",
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          "url": "https://mainstreetbloodlab.com/articles/men2-family-testing-surveillance-roadmap.html#related-guides-heading"
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          "name": "MedlinePlus Genetics: What do the results of genetic tests mean?",
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          "name": "Related guides",
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          "name": "FAQ",
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          "name": "CDC: Trichomoniasis",
          "url": "https://www.cdc.gov/std/treatment-guidelines/trichomoniasis.htm"
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        {
          "name": "CDC: STI Testing",
          "url": "https://www.cdc.gov/sti/testing/index.html"
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          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "NICHD: Vaginitis",
          "url": "https://www.nichd.nih.gov/health/topics/vaginitis"
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        {
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          "name": "Different tests answer different questions",
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        {
          "name": "When to seek care instead of retesting",
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          "name": "What a consumer report cannot tell you",
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          "name": "FAQ",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/vaginal-microbiome-testing.html#related-guides-heading"
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      "position": 311,
      "title": "Microbiome testing after antibiotics",
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          "name": "CDC: About Microbial Ecology",
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          "name": "NCCIH: Probiotics - What You Need To Know",
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          "name": "NIH Common Fund: Human Microbiome Project",
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        {
          "name": "MedlinePlus: C. diff Testing",
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          "name": "Questions to ask",
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          "name": "What retesting still cannot prove",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
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          "name": "AGA Clinical Practice Update on SIBO",
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          "name": "What the breath test still cannot prove",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/sibo-breath-test.html#faq-heading"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/sibo-breath-test.html#related-guides-heading"
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      "position": 313,
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          "name": "NIDDK: Symptoms & Causes of Celiac Disease",
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          "name": "AAAAI: The Myth of IgG Food Panel Testing",
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          "name": "PMC: The Intestinal Barrier and Current Techniques for the Assessment of Gut Permeability",
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          "name": "Questions to ask",
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          "name": "What permeability testing still cannot prove",
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        {
          "name": "FAQ",
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          "name": "Related guides",
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      "position": 314,
      "title": "Digestive enzyme testing claims",
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          "name": "NIDDK: Diagnosis for Exocrine Pancreatic Insufficiency",
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          "name": "AGA Clinical Practice Update on Exocrine Pancreatic Insufficiency",
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        {
          "name": "MedlinePlus: Fecal Fat",
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          "name": "NIDDK: Irritable Bowel Syndrome",
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          "name": "When EPI should be considered",
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        },
        {
          "name": "What enzyme tests still cannot prove",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/digestive-enzyme-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/digestive-enzyme-testing-claims.html#related-guides-heading"
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        {
          "name": "What can raise calprotectin",
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          "name": "FAQ",
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        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/fecal-calprotectin-test.html#related-guides-heading"
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      "position": 316,
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          "name": "AGA: The Role of Biomarkers for the Management of Ulcerative Colitis",
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        },
        {
          "name": "When to use each test",
          "url": "https://mainstreetbloodlab.com/articles/fecal-calprotectin-vs-lactoferrin.html#when-to-use-each-test"
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        {
          "name": "What can distort the result",
          "url": "https://mainstreetbloodlab.com/articles/fecal-calprotectin-vs-lactoferrin.html#what-can-distort-the-result"
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/fecal-calprotectin-vs-lactoferrin.html#related-guides-heading"
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      "title": "Stool WBC test and inflammatory diarrhea",
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      "sourceTag": "MedlinePlus + CDC",
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          "name": "MedlinePlus: Calprotectin Stool Test",
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        {
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          "name": "NIDDK: Diarrhea",
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        {
          "name": "CDC archive: C. diff infection",
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          "name": "NIDDK: Symptoms & Causes of Diarrhea",
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          "name": "How to read the clue",
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        {
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        {
          "name": "When the stool WBC should not be the main focus",
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        {
          "name": "Questions to ask",
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          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-wbc-test-inflammatory-diarrhea.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-wbc-test-inflammatory-diarrhea.html#related-guides-heading"
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      "position": 318,
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      "topic": "microbiome",
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      "description": "Breath tests, stool antigen, blood antibody limits, endoscopy biopsy, prep, and test-of-cure.",
      "sourceTag": "MedlinePlus + NIDDK + ACG",
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          "url": "https://mainstreetbloodlab.com/articles/strongyloides-antibody-vs-stool-test.html#when-each-test-fits"
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        {
          "name": "Why a negative stool test may not settle it",
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        {
          "name": "What a positive antibody can and cannot say",
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        {
          "name": "Why it can be high-stakes",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/strongyloides-antibody-vs-stool-test.html#related-guides-heading"
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          "name": "CDC: Clinical Overview of Pinworm Infection",
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          "name": "CDC: About Pinworm Infection",
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          "name": "CDC: Preventing Pinworm Infection",
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          "name": "MedlinePlus: Pinworm Test",
          "url": "https://medlineplus.gov/ency/article/003452.htm"
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          "name": "MedlinePlus: Parasitic Diseases",
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          "name": "What a positive result can mean",
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          "name": "What the test cannot do",
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          "name": "Questions to ask",
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          "name": "FAQ",
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          "name": "CDC: About Hookworm",
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          "name": "CDC: Diagnosis of Parasitic Diseases",
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          "name": "CDC: About Soil-transmitted Helminths",
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          "name": "WHO: Soil-transmitted helminthiases",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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          "name": "What the workup may include",
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          "name": "Why anemia comes up",
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          "name": "Why negative results need context",
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          "name": "When medical care matters more than another stool sample",
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          "name": "Questions to ask",
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        {
          "name": "Related guides",
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          "name": "CDC: Diagnosis of Parasitic Diseases",
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        {
          "name": "CDC: About Soil-transmitted Helminths",
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          "name": "WHO: Soil-transmitted helminthiases",
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        {
          "name": "CDC: About Parasites",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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          "name": "What testing can and cannot show",
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        {
          "name": "Why soil-transmitted helminths matter",
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          "name": "Why negative results need context",
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          "name": "When medical care matters more than repeat samples",
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        {
          "name": "Related guides",
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          "name": "CDC: About Whipworms",
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          "name": "CDC: About Soil-transmitted Helminths",
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          "name": "WHO: Soil-transmitted helminthiases",
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        {
          "name": "CDC: Diagnosis of Parasitic Diseases",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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        {
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        {
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        {
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          "name": "Related guides",
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          "name": "CDC: Clinical Overview of Taeniasis",
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        {
          "name": "CDC: About Human Tapeworm",
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        {
          "name": "WHO: Taeniasis and cysticercosis",
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        {
          "name": "CDC: Diagnosis of Parasitic Diseases",
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        {
          "name": "MedlinePlus: Stool Ova and Parasites Exam",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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        {
          "name": "Why species context matters",
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          "name": "When repeat samples matter",
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          "name": "Questions to ask",
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          "name": "Related guides",
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          "name": "CDC: Clinical Testing and Diagnosis for Schistosomiasis",
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          "name": "CDC: About Schistosomiasis",
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          "name": "CDC Yellow Book: Schistosomiasis",
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          "name": "MedlinePlus: Schistosomiasis",
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          "name": "WHO guideline on control and elimination of human schistosomiasis",
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          "name": "Why travel history is central",
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          "name": "FAQ",
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          "name": "CDC DPDx: Echinococcosis",
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          "name": "CDC: Diagnosis of Parasitic Diseases",
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          "name": "CDC Yellow Book: Post-Travel Parasitic Disease Including Evaluation of Eosinophilia",
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        {
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          "name": "CDC: Clinical Care of Toxocariasis",
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          "name": "CDC: About Toxocariasis",
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          "name": "CDC DPDx: Toxocariasis",
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          "name": "CDC: Diagnosis of Parasitic Diseases",
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        {
          "name": "What a positive antibody can and cannot say",
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        {
          "name": "Why stool testing is usually the wrong mental model",
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          "name": "Questions to ask",
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          "name": "Related guides",
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          "name": "MedlinePlus: Ova and Parasite Test",
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        {
          "name": "NCBI Bookshelf: Cestodes - Medical Microbiology",
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          "name": "Related guides",
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          "name": "PMC: Dientamoeba fragilis, the Neglected Trichomonad of the Human Bowel",
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          "name": "CDC Yellow Book: Post-Travel Diarrhea",
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          "name": "CDC DPDx: Stool Specimens - Molecular Diagnosis",
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          "name": "CDC Clinical Overview of Shigellosis",
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        {
          "name": "PMC: Multiple Pathogens on GI PCR",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11365154/"
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        {
          "name": "PMC: Multiplex Molecular Panels for GI Infection",
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          "name": "NIDDK: Diarrhea",
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        {
          "name": "When to broaden the workup",
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          "name": "What not to do",
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          "name": "Questions to ask",
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          "name": "When another test matters more",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-co-detection-interpretation.html#when-another-test-matters-more"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-co-detection-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-co-detection-interpretation.html#related-guides-heading"
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      "title": "Stool PCR negative with persistent diarrhea",
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        {
          "name": "CDC Yellow Book: Post-Travel Diarrhea",
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          "name": "CDC Yellow Book: Post-Travel Parasitic Disease",
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        {
          "name": "CDC Laboratory Diagnosis of Giardiasis",
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        {
          "name": "PMC: Enteropathogen Multiplex NAAT Interpretation",
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        {
          "name": "When to broaden the workup",
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          "name": "When repeat testing helps",
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-negative-with-persistent-diarrhea.html#related-guides-heading"
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      "position": 378,
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        {
          "name": "MedlinePlus: Gastroenteritis",
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        {
          "name": "CDC Yellow Book: Post-Travel Diarrhea",
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        {
          "name": "PMC: Multiplex PCR for Gastrointestinal Pathogens",
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        {
          "name": "PMC: Diarrheagenic E. coli Pathotypes",
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          "name": "IDSA: Infectious Diarrhea Guidelines",
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          "name": "How to frame the result",
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        {
          "name": "When STEC changes management",
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        {
          "name": "What not to do",
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        {
          "name": "Questions to ask",
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        {
          "name": "When follow-up matters more",
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        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-e-coli-pathotype-interpretation.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-e-coli-pathotype-interpretation.html#related-guides-heading"
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    {
      "position": 379,
      "title": "Post-infectious IBS testing questions",
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        {
          "name": "CDC Yellow Book: Post-Travel Diarrhea",
          "url": "https://www.cdc.gov/yellow-book/hcp/post-travel-evaluation/post-travel-diarrhea.html"
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        {
          "name": "CDC Yellow Book: Travelers' Diarrhea",
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          "name": "MedlinePlus: Celiac Disease Screening",
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        {
          "name": "IDSA: Infectious Diarrhea Guidelines",
          "url": "https://www.idsociety.org/practice-guideline/infectious-diarrhea/"
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        {
          "name": "PMC: Post-infectious IBS Review",
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          "name": "MedlinePlus: Laboratory Tests",
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          "name": "When stool testing helps",
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          "name": "Questions to ask",
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          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/post-infectious-ibs-testing-questions.html#related-guides-heading"
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      "url": "https://mainstreetbloodlab.com/articles/stool-pcr-c-difficile-co-detection-interpretation.html",
      "topic": "microbiome",
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        {
          "name": "CDC: About C. diff",
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        {
          "name": "CDC: Clinical Overview of C. diff",
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        {
          "name": "IDSA/SHEA: C. difficile Guidelines",
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        {
          "name": "MedlinePlus: C. diff Testing",
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        {
          "name": "PMC: Multiplex PCR for Gastrointestinal Pathogens",
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        {
          "name": "When to broaden the workup",
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        {
          "name": "What not to do",
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        {
          "name": "Questions to ask",
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        {
          "name": "When another test matters more",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-c-difficile-co-detection-interpretation.html#when-another-test-matters-more"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-c-difficile-co-detection-interpretation.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-c-difficile-co-detection-interpretation.html#related-guides-heading"
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      "position": 381,
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          "name": "CDC: Norovirus Specimen Collection",
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        {
          "name": "CDC: Norovirus",
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        {
          "name": "CDC: Outbreak Specimen Collection",
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        {
          "name": "CDC: Norovirus Infection Control Background",
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          "name": "MedlinePlus: Gastroenteritis",
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        {
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          "name": "What not to assume",
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-norovirus-positive-interpretation.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-norovirus-positive-interpretation.html#related-guides-heading"
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      "position": 382,
      "title": "Stool PCR sapovirus positive interpretation",
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          "name": "CDC: Confirming an Etiology in Foodborne Outbreaks",
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        },
        {
          "name": "CDC: Outbreak Specimen Collection",
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        {
          "name": "CDC: CaliciNet Surveillance Network",
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        {
          "name": "Emerging Infectious Diseases: Sapovirus Outbreaks in Long-Term Care Facilities",
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        {
          "name": "Emerging Infectious Diseases: Genetic Diversity of Sapovirus in Children",
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        {
          "name": "PMC: Multiplex Real-Time PCR for Gastroenteritis Viruses in Stool Samples",
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          "name": "MedlinePlus: Gastroenteritis",
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        {
          "name": "When testing is most useful",
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        {
          "name": "What not to assume",
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-sapovirus-positive-interpretation.html#related-guides-heading"
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        },
        {
          "name": "CDC: Outbreak Specimen Collection",
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          "name": "Emerging Infectious Diseases: Astrovirus Detection in Stool Samples",
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        {
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          "name": "MedlinePlus: Gastroenteritis",
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        {
          "name": "How to frame the result",
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        {
          "name": "When testing is most useful",
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        {
          "name": "What not to assume",
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        {
          "name": "Questions to ask",
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        {
          "name": "When symptoms matter more",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-astrovirus-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-astrovirus-positive-interpretation.html#related-guides-heading"
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    {
      "position": 384,
      "title": "Stool PCR rotavirus positive interpretation",
      "url": "https://mainstreetbloodlab.com/articles/stool-pcr-rotavirus-positive-interpretation.html",
      "topic": "microbiome",
      "topicName": "Microbiome and stool testing",
      "description": "Viral gastroenteritis, vaccination context, GI panels, shedding, dehydration risk, and follow-up.",
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      "sourceCount": 7,
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        {
          "name": "CDC: Clinical Overview of Rotavirus",
          "url": "https://www.cdc.gov/rotavirus/hcp/clinical-overview/index.html"
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        {
          "name": "CDC: About Rotavirus",
          "url": "https://www.cdc.gov/rotavirus/about/index.html"
        },
        {
          "name": "CDC: Rotavirus Vaccine Recommendations",
          "url": "https://www.cdc.gov/rotavirus/hcp/vaccine-considerations/index.html"
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        {
          "name": "CDC: Rotavirus Surveillance Manual",
          "url": "https://www.cdc.gov/surv-manual/php/table-of-contents/chapter-13-rotavirus.html"
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        {
          "name": "CDC: Outbreak Specimen Collection",
          "url": "https://www.cdc.gov/foodborne-outbreaks/php/confirming-cause/specimen-collection.html"
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        {
          "name": "CDC: Rotavirus Vaccine Safety",
          "url": "https://www.cdc.gov/vaccine-safety/vaccines/rotavirus.html"
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        {
          "name": "MedlinePlus: Gastroenteritis",
          "url": "https://medlineplus.gov/gastroenteritis.html"
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          "name": "FAQ",
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          "name": "Related guides",
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      "position": 385,
      "title": "Stool PCR adenovirus positive interpretation",
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        {
          "name": "CDC: About Adenovirus",
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        {
          "name": "CDC: Guidelines for Outbreaks | Adenovirus",
          "url": "https://www.cdc.gov/adenovirus/hcp/outbreaks/index.html"
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          "name": "MedlinePlus: Gastroenteritis",
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        {
          "name": "MedlinePlus: PCR Tests",
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        {
          "name": "NCBI Bookshelf: Viral Diarrhea",
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        {
          "name": "NCBI Bookshelf: Adenoviruses",
          "url": "https://www.ncbi.nlm.nih.gov/sites/books/NBK559072/"
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          "name": "How to frame the result",
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          "name": "When it is most useful",
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          "name": "What not to assume",
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-adenovirus-positive-interpretation.html#related-guides-heading"
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      "position": 386,
      "title": "Stool PCR Campylobacter positive interpretation",
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      "sourceCount": 7,
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        {
          "name": "CDC: Clinical Overview of Campylobacter",
          "url": "https://www.cdc.gov/campylobacter/hcp/clinical-overview/index.html"
        },
        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
          "url": "https://www.cdc.gov/foodnet/reports/cidt.html"
        },
        {
          "name": "MedlinePlus: Campylobacter Infections",
          "url": "https://medlineplus.gov/campylobacterinfections.html"
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        {
          "name": "MedlinePlus: Diarrhea",
          "url": "https://medlineplus.gov/diarrhea.html"
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        {
          "name": "MedlinePlus: Fecal culture",
          "url": "https://medlineplus.gov/ency/article/003758.htm"
        },
        {
          "name": "MedlinePlus: Stool Culture",
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          "name": "How to frame the result",
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        {
          "name": "What follow-up may matter",
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        {
          "name": "When culture still matters",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-campylobacter-positive-interpretation.html#when-culture-still-matters"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-campylobacter-positive-interpretation.html#questions-to-ask"
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          "name": "When another test matters more",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-campylobacter-positive-interpretation.html#when-another-test-matters-more"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-campylobacter-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-campylobacter-positive-interpretation.html#related-guides-heading"
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      "position": 387,
      "title": "Stool PCR Salmonella positive interpretation",
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      "topicName": "Microbiome and stool testing",
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      "sourceTag": "CDC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC: Clinical Overview of Salmonellosis",
          "url": "https://www.cdc.gov/salmonella/hcp/clinical-overview/index.html"
        },
        {
          "name": "CDC: About Salmonella Infection",
          "url": "https://www.cdc.gov/salmonella/about/index.html"
        },
        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
          "url": "https://www.cdc.gov/foodnet/reports/cidt.html"
        },
        {
          "name": "CDC: Confirming an Etiology in Foodborne Outbreaks",
          "url": "https://www.cdc.gov/foodborne-outbreaks/php/confirming-cause/index.html"
        },
        {
          "name": "MedlinePlus: Salmonella Infections",
          "url": "https://medlineplus.gov/salmonellainfections.html"
        },
        {
          "name": "MedlinePlus: Diarrhea",
          "url": "https://medlineplus.gov/diarrhea.html"
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          "name": "MedlinePlus: Stool Culture",
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          "name": "How to frame the result",
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        {
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        {
          "name": "When culture still matters",
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-salmonella-positive-interpretation.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-salmonella-positive-interpretation.html#related-guides-heading"
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      "position": 388,
      "title": "Stool PCR Shigella positive interpretation",
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      "sourceTag": "CDC",
      "sourceCount": 7,
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        {
          "name": "CDC: Clinical Overview of Shigellosis",
          "url": "https://www.cdc.gov/shigella/hcp/clinical-overview/index.html"
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        {
          "name": "CDC: Clinical Care of Shigellosis",
          "url": "https://www.cdc.gov/shigella/hcp/clinical-care/index.html"
        },
        {
          "name": "CDC: Antimicrobial Resistance and Shigella Infections",
          "url": "https://www.cdc.gov/shigella/treatment/antimicrobial-resistance-and-shigella-infections.html"
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        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
          "url": "https://www.cdc.gov/foodnet/reports/cidt.html"
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        {
          "name": "MedlinePlus: Shigellosis",
          "url": "https://medlineplus.gov/ency/article/000295.htm"
        },
        {
          "name": "MedlinePlus: Diarrhea",
          "url": "https://medlineplus.gov/diarrhea.html"
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        {
          "name": "MedlinePlus: Stool Culture",
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        {
          "name": "How to frame the result",
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        {
          "name": "What follow-up may matter",
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        {
          "name": "When culture still matters",
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-shigella-positive-interpretation.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-shigella-positive-interpretation.html#related-guides-heading"
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    {
      "position": 389,
      "title": "Stool PCR STEC positive interpretation",
      "url": "https://mainstreetbloodlab.com/articles/stool-pcr-stec-positive-interpretation.html",
      "topic": "microbiome",
      "topicName": "Microbiome and stool testing",
      "description": "Shiga toxin, E. coli O157, HUS risk, culture, antibiotics, public health, and follow-up.",
      "sourceTag": "CDC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC: Laboratory Testing for E. coli",
          "url": "https://www.cdc.gov/ecoli/php/laboratories/index.html"
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        {
          "name": "CDC: Information for Clinicians",
          "url": "https://www.cdc.gov/ecoli/hcp/guidance/index.html"
        },
        {
          "name": "CDC MMWR: Diagnosis of STEC Infections",
          "url": "https://www.cdc.gov/mmwr/preview/mmwrhtml/rr5812a1.htm"
        },
        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
          "url": "https://www.cdc.gov/foodnet/reports/cidt.html"
        },
        {
          "name": "MedlinePlus: E. coli Infections",
          "url": "https://medlineplus.gov/ecoliinfections.html"
        },
        {
          "name": "MedlinePlus: Hemolytic-uremic syndrome",
          "url": "https://medlineplus.gov/ency/article/000510.htm"
        },
        {
          "name": "MedlinePlus: Stool Culture",
          "url": "https://medlineplus.gov/lab-tests/stool-culture/"
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          "name": "Short answer",
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        {
          "name": "How to frame the result",
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        {
          "name": "What follow-up may matter",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-stec-positive-interpretation.html#what-follow-up-may-matter"
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        {
          "name": "When culture still matters",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-stec-positive-interpretation.html#when-culture-still-matters"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-stec-positive-interpretation.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-stec-positive-interpretation.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-stec-positive-interpretation.html#related-guides-heading"
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      "position": 390,
      "title": "Stool PCR Yersinia positive interpretation",
      "url": "https://mainstreetbloodlab.com/articles/stool-pcr-yersinia-positive-interpretation.html",
      "topic": "microbiome",
      "topicName": "Microbiome and stool testing",
      "description": "CIDT, culture, Y. enterocolitica, iron-risk context, pseudoappendicitis, and follow-up.",
      "sourceTag": "CDC",
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      "sources": [
        {
          "name": "CDC: Clinical Overview of Yersiniosis",
          "url": "https://www.cdc.gov/yersinia/hcp/clinical-overview/index.html"
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        {
          "name": "CDC: Laboratory Testing for Yersinia",
          "url": "https://www.cdc.gov/yersinia/php/laboratories/index.html"
        },
        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
          "url": "https://www.cdc.gov/foodnet/reports/cidt.html"
        },
        {
          "name": "MedlinePlus: Diarrhea",
          "url": "https://medlineplus.gov/diarrhea.html"
        },
        {
          "name": "MedlinePlus: Fecal culture",
          "url": "https://medlineplus.gov/ency/article/003758.htm"
        },
        {
          "name": "CDC Food Safety: Signs and Symptoms of Food Poisoning",
          "url": "https://www.cdc.gov/food-safety/signs-symptoms/"
        },
        {
          "name": "NIDDK: Diarrhea",
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          "name": "Short answer",
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        {
          "name": "How to frame the result",
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        {
          "name": "What follow-up may matter",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-yersinia-positive-interpretation.html#what-follow-up-may-matter"
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        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-yersinia-positive-interpretation.html#when-symptoms-matter"
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        {
          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-yersinia-positive-interpretation.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-yersinia-positive-interpretation.html#related-guides-heading"
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      "position": 391,
      "title": "Stool PCR Vibrio positive interpretation",
      "url": "https://mainstreetbloodlab.com/articles/stool-pcr-vibrio-positive-interpretation.html",
      "topic": "microbiome",
      "topicName": "Microbiome and stool testing",
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      "sourceTag": "CDC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC: Clinical Overview of Vibriosis",
          "url": "https://www.cdc.gov/vibrio/hcp/clinical-overview/index.html"
        },
        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
          "url": "https://www.cdc.gov/foodnet/reports/cidt.html"
        },
        {
          "name": "CDC FoodNet: Diagnostic Laboratory Practices",
          "url": "https://www.cdc.gov/foodnet/data/laboratory-practices.html"
        },
        {
          "name": "MedlinePlus: Diarrhea",
          "url": "https://medlineplus.gov/diarrhea.html"
        },
        {
          "name": "MedlinePlus: Fecal culture",
          "url": "https://medlineplus.gov/ency/article/003758.htm"
        },
        {
          "name": "CDC Food Safety: Signs and Symptoms of Food Poisoning",
          "url": "https://www.cdc.gov/food-safety/signs-symptoms/"
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        {
          "name": "NIDDK: Diarrhea",
          "url": "https://www.niddk.nih.gov/health-information/digestive-diseases/diarrhea"
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        {
          "name": "Short answer",
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        {
          "name": "How to frame the result",
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        {
          "name": "What follow-up may matter",
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        {
          "name": "When symptoms matter",
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        {
          "name": "Questions to ask",
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        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-vibrio-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-vibrio-positive-interpretation.html#related-guides-heading"
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    {
      "position": 392,
      "title": "Stool PCR Plesiomonas positive interpretation",
      "url": "https://mainstreetbloodlab.com/articles/stool-pcr-plesiomonas-positive-interpretation.html",
      "topic": "microbiome",
      "topicName": "Microbiome and stool testing",
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      "sourceTag": "CDC + PMC",
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          "name": "CDC Yellow Book: Post-Travel Diarrhea",
          "url": "https://www.cdc.gov/yellow-book/hcp/post-travel-evaluation/post-travel-diarrhea.html"
        },
        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
          "url": "https://www.cdc.gov/foodnet/reports/cidt.html"
        },
        {
          "name": "Clinical features, epidemiology, and treatment of Plesiomonas shigelloides diarrhea",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC267470/"
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        {
          "name": "Plesiomonas: A Review on Food Safety, Fish-Borne Diseases, and Tilapia",
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        {
          "name": "MedlinePlus: Diarrhea",
          "url": "https://medlineplus.gov/diarrhea.html"
        },
        {
          "name": "MedlinePlus: Fecal culture",
          "url": "https://medlineplus.gov/ency/article/003758.htm"
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          "name": "NIDDK: Diarrhea",
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          "name": "How to frame the result",
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-plesiomonas-positive-interpretation.html#related-guides-heading"
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        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
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        {
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        {
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          "name": "How to frame the result",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-aeromonas-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-aeromonas-positive-interpretation.html#related-guides-heading"
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          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
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          "name": "How to frame the result",
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        {
          "name": "What follow-up may matter",
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          "name": "When symptoms matter",
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-entamoeba-histolytica-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
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      "position": 395,
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        {
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          "name": "CDC: Giardia Infection Prevention and Control",
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          "name": "MedlinePlus: Giardia Infections",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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        {
          "name": "CDC FoodNet: Culture-Independent Diagnostic Tests",
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        {
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        {
          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-giardia-positive-interpretation.html#related-guides-heading"
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        {
          "name": "CDC DPDx: Cryptosporidiosis",
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          "name": "CDC: Symptoms of Crypto",
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        {
          "name": "CDC: About Crypto Infections",
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        {
          "name": "MedlinePlus: Diarrhea",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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          "name": "MedlinePlus: Parasitic Diseases",
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        {
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        {
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          "name": "Questions to ask",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-cryptosporidium-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-cryptosporidium-positive-interpretation.html#related-guides-heading"
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      "position": 397,
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        {
          "name": "CDC DPDx: Cyclosporiasis",
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          "name": "CDC: Cyclosporiasis Provider Fact Sheet",
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        {
          "name": "CDC: Surveillance of Cyclosporiasis",
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        {
          "name": "CDC: Diagnosis of Parasitic Diseases",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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        {
          "name": "MedlinePlus: Parasitic Diseases",
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        {
          "name": "What follow-up may matter",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-cyclospora-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-cyclospora-positive-interpretation.html#related-guides-heading"
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      "title": "Stool PCR enterotoxigenic E. coli positive interpretation",
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      "topic": "microbiome",
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        {
          "name": "CDC Information for Clinicians: E. coli",
          "url": "https://www.cdc.gov/ecoli/hcp/guidance/index.html"
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        {
          "name": "MedlinePlus: Gastroenteritis",
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        {
          "name": "CDC Yellow Book: Post-travel Diarrhea",
          "url": "https://www.cdc.gov/yellow-book/hcp/post-travel-evaluation/post-travel-diarrhea.html"
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        {
          "name": "PMC: Multiplex PCR for Gastrointestinal Pathogens",
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          "name": "PMC: Diarrheagenic E. coli Pathotypes",
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        {
          "name": "IDSA: Infectious Diarrhea Guidelines",
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        {
          "name": "How to frame the result",
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        {
          "name": "When ETEC is more likely",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-enterotoxigenic-e-coli-positive-interpretation.html#when-etec-is-more-likely"
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        {
          "name": "When not to overcall it",
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          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-enterotoxigenic-e-coli-positive-interpretation.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-enterotoxigenic-e-coli-positive-interpretation.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-enterotoxigenic-e-coli-positive-interpretation.html#related-guides-heading"
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      "url": "https://mainstreetbloodlab.com/articles/stool-pcr-parasite-panel-false-negative-questions.html",
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        {
          "name": "CDC DPDx: Stool Specimens - Molecular Diagnosis",
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          "name": "CDC: Diagnosis of Parasitic Diseases",
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        {
          "name": "MedlinePlus: Ova and Parasite Test",
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        {
          "name": "MedlinePlus: Ova and Parasite Exam",
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        {
          "name": "MedlinePlus: Parasitic Diseases",
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          "name": "Why a negative panel can still miss parasites",
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        {
          "name": "When repeat or different testing is considered",
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        {
          "name": "How specimen and timing matter",
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          "name": "When a different specimen or test matters",
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          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-parasite-panel-false-negative-questions.html#questions-to-ask"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/stool-pcr-parasite-panel-false-negative-questions.html#related-guides-heading"
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        {
          "name": "CDC Information for Clinicians: E. coli",
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        {
          "name": "MedlinePlus: Gastroenteritis",
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        {
          "name": "CDC Yellow Book: Post-travel Diarrhea",
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        {
          "name": "PMC: Multiplex PCR for Gastrointestinal Pathogens",
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        {
          "name": "PMC: Diarrheagenic E. coli Pathotypes",
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          "name": "PMC: Multiplex PCR for Gastrointestinal Pathogens",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "What it cannot prove",
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          "name": "FAQ",
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          "name": "FAQ",
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          "name": "FAQ",
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          "name": "What can affect readings",
          "url": "https://mainstreetbloodlab.com/articles/wearable-oxygen-saturation-respiratory-rate.html#what-can-affect-readings"
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        {
          "name": "When not to wait on a device",
          "url": "https://mainstreetbloodlab.com/articles/wearable-oxygen-saturation-respiratory-rate.html#when-not-to-wait-on-a-device"
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        {
          "name": "What a medical-grade test adds",
          "url": "https://mainstreetbloodlab.com/articles/wearable-oxygen-saturation-respiratory-rate.html#what-a-medical-grade-test-adds"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/wearable-oxygen-saturation-respiratory-rate.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/wearable-oxygen-saturation-respiratory-rate.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/wearable-oxygen-saturation-respiratory-rate.html#related-guides-heading"
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    {
      "position": 425,
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      "description": "Fever confusion, cycle tracking, illness-prediction claims, sensor limits, and thermometer use.",
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        {
          "name": "MedlinePlus: Temperature Measurement",
          "url": "https://medlineplus.gov/ency/article/003400.htm"
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          "name": "PubMed: Using Wearable Skin Temperature Data to Advance Tracking and Characterization of the Menstrual Cycle in a Real-World Setting",
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        {
          "name": "PubMed: The Accuracy of Wrist Skin Temperature in Detecting Ovulation Compared to Basal Body Temperature",
          "url": "https://pubmed.ncbi.nlm.nih.gov/34100763/"
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        {
          "name": "PubMed: Wearable Sensor Technology to Predict Core Body Temperature: A Systematic Review",
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        {
          "name": "MedlinePlus: Vital Signs",
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          "name": "What skin temperature trends can mean",
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          "name": "What skin temperature cannot tell you",
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          "name": "When to use a thermometer or seek care",
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          "name": "Questions to ask",
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        {
          "name": "What validation should look like",
          "url": "https://mainstreetbloodlab.com/articles/skin-temperature-illness-wearables.html#what-validation-should-look-like"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/skin-temperature-illness-wearables.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/skin-temperature-illness-wearables.html#related-guides-heading"
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      "position": 426,
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          "name": "MedlinePlus: Autonomic Testing",
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          "name": "MedlinePlus: Dysautonomia",
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          "name": "PubMed: Smart Devices and Wearable Technologies to Detect and Monitor Mental Health Conditions and Stress: A Systematic Review",
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        {
          "name": "PubMed: Wearables for Stress Management: A Scoping Review",
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        {
          "name": "PubMed: Generalizable machine learning for stress monitoring from wearable devices: A systematic literature review",
          "url": "https://pubmed.ncbi.nlm.nih.gov/36893657/"
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        {
          "name": "NCBI Bookshelf: Physiology, Autonomic Nervous System",
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          "name": "What inputs may mean",
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          "name": "What the score cannot tell you",
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          "name": "How to use the score wisely",
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/wearable-stress-scores.html#questions-to-ask"
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        {
          "name": "What validation should look like",
          "url": "https://mainstreetbloodlab.com/articles/wearable-stress-scores.html#what-validation-should-look-like"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/wearable-stress-scores.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/wearable-stress-scores.html#related-guides-heading"
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      "title": "Recovery and readiness wearables",
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      "sourceTag": "AASM + NIH + MedlinePlus",
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          "name": "Systematic Review: Wearable Devices and HRV Accuracy",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29668452/"
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        {
          "name": "Scoping Review: Wearable Devices to Monitor Recovery",
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        {
          "name": "Validation of Sleep Measurement in a Consumer Wearable Device",
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        {
          "name": "Validation of Six Wearable Devices for Sleep, Heart Rate, and HRV",
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        {
          "name": "AASM Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29734997/"
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        {
          "name": "MedlinePlus: Sleep Study",
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        {
          "name": "NIH ODS Exercise and Athletic Performance Factsheet",
          "url": "https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-Consumer/"
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          "name": "Common score inputs",
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          "name": "When not to follow the score",
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        {
          "name": "Score blind spots",
          "url": "https://mainstreetbloodlab.com/articles/recovery-readiness-wearables.html#score-blind-spots"
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          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/recovery-readiness-wearables.html#when-follow-up-matters-more"
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        {
          "name": "What validation should look like",
          "url": "https://mainstreetbloodlab.com/articles/recovery-readiness-wearables.html#what-validation-should-look-like"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/recovery-readiness-wearables.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/recovery-readiness-wearables.html#related-guides-heading"
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      "position": 428,
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      "sourceTag": "FDA + AHA + NHLBI",
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          "name": "FDA: Do Not Use Unauthorized Devices for Measuring Blood Pressure",
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          "name": "FDA: Cuffless Non-invasive Blood Pressure Measuring Devices",
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          "name": "American Heart Association: Home Blood Pressure Monitoring",
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        {
          "name": "AHA and AMA: Self-Measured Blood Pressure Monitoring at Home",
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        {
          "name": "MedlinePlus: Blood Pressure Monitors for Home",
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        {
          "name": "NHLBI: High Blood Pressure Diagnosis",
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        {
          "name": "Claims to inspect",
          "url": "https://mainstreetbloodlab.com/articles/continuous-blood-pressure-monitoring-claims.html#claims-to-inspect"
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        {
          "name": "When a validated cuff is still needed",
          "url": "https://mainstreetbloodlab.com/articles/continuous-blood-pressure-monitoring-claims.html#when-a-validated-cuff-is-still-needed"
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        {
          "name": "What validation means",
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        {
          "name": "What to ask before you trust it",
          "url": "https://mainstreetbloodlab.com/articles/continuous-blood-pressure-monitoring-claims.html#what-to-ask-before-you-trust-it"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/continuous-blood-pressure-monitoring-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/continuous-blood-pressure-monitoring-claims.html#related-guides-heading"
        }
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    {
      "position": 429,
      "title": "Wearable hydration and sweat testing",
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Sweat sodium, electrolytes, sweat rate, dehydration alerts, athlete use, and accuracy limits.",
      "sourceTag": "PMC + MedlinePlus",
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          "name": "MedlinePlus: Sweat Test for Cystic Fibrosis",
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        {
          "name": "MedlinePlus: Electrolyte Panel",
          "url": "https://medlineplus.gov/lab-tests/electrolyte-panel"
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        {
          "name": "MedlinePlus: Dehydration",
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        {
          "name": "MedlinePlus: Water in Diet",
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        {
          "name": "CDC: Heat and Athletes",
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        {
          "name": "Review: Wearable Sweat Sensors",
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        {
          "name": "Review: Wearable Sensors for Monitoring Sweat Electrolytes",
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        {
          "name": "What these devices can measure",
          "url": "https://mainstreetbloodlab.com/articles/wearable-hydration-sweat-testing.html#what-these-devices-can-measure"
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        {
          "name": "Where the claims go wrong",
          "url": "https://mainstreetbloodlab.com/articles/wearable-hydration-sweat-testing.html#where-the-claims-go-wrong"
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        {
          "name": "Wearable sweat sensors vs sweat chloride testing",
          "url": "https://mainstreetbloodlab.com/articles/wearable-hydration-sweat-testing.html#wearable-sweat-sensors-vs-sweat-chloride-testing"
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          "name": "Who should be careful",
          "url": "https://mainstreetbloodlab.com/articles/wearable-hydration-sweat-testing.html#who-should-be-careful"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/wearable-hydration-sweat-testing.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/wearable-hydration-sweat-testing.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/wearable-hydration-sweat-testing.html#related-guides-heading"
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      ]
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      "position": 430,
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          "url": "https://medlineplus.gov/lab-tests/obesity-screening"
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        {
          "name": "NIDDK: Human Energy & Body Weight Regulation Core",
          "url": "https://www.niddk.nih.gov/research-funding/at-niddk/cores-support-services/human-energy-body-weight-regulation-core"
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          "name": "NIDDK: Metabolic Testing",
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        {
          "name": "NIH Technology Assessment Conference Statement: Bioelectrical impedance analysis in body composition measurement",
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        {
          "name": "FDA 510(k) Summary: InBody 230 Body Composition Analyzer",
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        {
          "name": "FDA 510(k) Summary: TANITA Body Fat Analyzer / Body Composition Monitor",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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        {
          "name": "What can distort results",
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        {
          "name": "Questions to ask",
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        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/body-composition-scale-accuracy.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/body-composition-scale-accuracy.html#related-guides-heading"
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      "position": 431,
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        {
          "name": "Validity of smartwatch-derived estimates of lactate threshold heart rate and pace compared to graded exercise testing",
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          "name": "Garmin Fénix 7 Underestimates Performance at the Lactate Threshold in Comparison to Standardized Blood Lactate Field Test",
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        {
          "name": "Monitoring Metabolic Status",
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          "name": "Detection of the Lactate Threshold in Runners: What is the Ideal Speed to Start an Incremental Test?",
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          "name": "Comparisons of the Metabolic Intensities at Heart Rate, Gas Exchange, and Ventilatory Thresholds",
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          "name": "What the estimate uses",
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        {
          "name": "Why it can miss",
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        {
          "name": "How to use it in training",
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        {
          "name": "When a lab test helps",
          "url": "https://mainstreetbloodlab.com/articles/lactate-threshold-wearable-estimates.html#when-a-lab-test-helps"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/lactate-threshold-wearable-estimates.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/lactate-threshold-wearable-estimates.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/lactate-threshold-wearable-estimates.html#related-guides-heading"
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      "position": 432,
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          "name": "PubMed: Indirect calorimetry: The 6 main issues",
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        {
          "name": "PubMed: Best practice methods to apply to measurement of resting metabolic rate in adults: a systematic review",
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        {
          "name": "PubMed: Cardiopulmonary Exercise Testing",
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          "name": "PubMed: Cardiopulmonary Exercise Test: Background, Applicability and Interpretation",
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          "name": "PubMed: Measurement of the maximum oxygen uptake V̇o2max: V̇o2peak is no longer acceptable",
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          "name": "PubMed: Assessment of anaerobic power to verify VO2max attainment",
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          "name": "PubMed: Methods to Assess Energy Expenditure of Resistance Exercise: A Systematic Scoping Review",
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        {
          "name": "Questions before paying",
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          "name": "FAQ",
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/metabolic-cart-test.html#related-guides-heading"
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          "name": "Related guides",
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          "name": "FAQ",
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          "name": "Related guides",
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          "name": "Related guides",
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          "name": "FAQ",
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          "url": "https://www.acponline.org/acp-newsroom/acp-issues-guideline-for-testosterone-treatment-in-adult-men-with-age-related-low-testosterone"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
        },
        {
          "name": "MedlinePlus: Laboratory Tests",
          "url": "https://medlineplus.gov/laboratorytests.html"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
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      "sections": [
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#short-answer"
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        {
          "name": "What matters most",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#what-matters-most"
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        {
          "name": "When a blood draw beats a home kit",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#when-a-blood-draw-beats-a-home-kit"
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        {
          "name": "When to be skeptical",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#when-to-be-skeptical"
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        {
          "name": "When other causes matter",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#when-other-causes-matter"
        },
        {
          "name": "When a general lab reference matters more",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#when-a-general-lab-reference-matters-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/at-home-testosterone-optimization-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 441,
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      "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html",
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      "topicName": "Emerging biometrics",
      "description": "Plasma amino acids, nutrition dashboards, metabolic-disorder context, supplements, and actionability limits.",
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          "name": "MedlinePlus: Plasma Amino Acids",
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        {
          "name": "MedlinePlus: Amino Acid Metabolism Disorders",
          "url": "https://medlineplus.gov/aminoacidmetabolismdisorders.html"
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        {
          "name": "NCBI Bookshelf: Amino Acid Synthesis and Degradation",
          "url": "https://www.ncbi.nlm.nih.gov/sites/books/n/statpearls/article-741/"
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          "name": "Mayo Clinic Laboratories: AAQP - Overview: Amino Acids, Quantitative, Plasma",
          "url": "https://www.mayocliniclabs.com/test-catalog/Performance/9265"
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        {
          "name": "Labcorp: Amino Acid Profile, Quantitative, Plasma",
          "url": "https://www.labcorp.com/tests/700068/amino-acid-profile-quantitative-plasma"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html#short-answer"
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        {
          "name": "Separate the test from the claims",
          "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html#separate-the-test-from-the-claims"
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        {
          "name": "Why context changes everything",
          "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html#why-context-changes-everything"
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        {
          "name": "Questions before buying",
          "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html#questions-before-buying"
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        {
          "name": "When targeted testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html#when-targeted-testing-matters-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-amino-acid-panel-claims.html#related-guides-heading"
        }
      ]
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      "position": 442,
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      "topicName": "Emerging biometrics",
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          "name": "MedlinePlus: FSH Levels Test",
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        {
          "name": "MedlinePlus: Estradiol blood test",
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        {
          "name": "FDA: Menopause",
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          "name": "ACOG: Hormone Therapy for Menopause",
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          "name": "ACOG: Compounded Bioidentical Menopausal Hormone Therapy",
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          "name": "ACOG: Menopause",
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          "name": "MedlinePlus: Laboratory Tests",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "MedlinePlus: Hormones",
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          "name": "Short answer",
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        {
          "name": "Claims to separate",
          "url": "https://mainstreetbloodlab.com/articles/at-home-menopause-hormone-panel-claims.html#claims-to-separate"
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        {
          "name": "When hormone numbers help",
          "url": "https://mainstreetbloodlab.com/articles/at-home-menopause-hormone-panel-claims.html#when-hormone-numbers-help"
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        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/at-home-menopause-hormone-panel-claims.html#when-follow-up-matters"
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        {
          "name": "Questions before buying",
          "url": "https://mainstreetbloodlab.com/articles/at-home-menopause-hormone-panel-claims.html#questions-before-buying"
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        {
          "name": "When a general lab reference matters more",
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        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/at-home-menopause-hormone-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/at-home-menopause-hormone-panel-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 443,
      "title": "Consumer micronutrient panel claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-micronutrient-panel-claims.html",
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      "topicName": "Emerging biometrics",
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      "sourceTag": "FDA + NIH ODS",
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          "name": "NIH ODS: Vitamin and Mineral Fact Sheets",
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        {
          "name": "MedlinePlus: Vitamin D Test",
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        {
          "name": "MedlinePlus: Vitamin B12 level",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "How to evaluate a panel",
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        {
          "name": "Questions before buying",
          "url": "https://mainstreetbloodlab.com/articles/consumer-micronutrient-panel-claims.html#questions-before-buying"
        },
        {
          "name": "When targeted tests beat a dashboard",
          "url": "https://mainstreetbloodlab.com/articles/consumer-micronutrient-panel-claims.html#when-targeted-tests-beat-a-dashboard"
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        {
          "name": "When targeted testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-micronutrient-panel-claims.html#when-targeted-testing-matters-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-micronutrient-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-micronutrient-panel-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 444,
      "title": "Consumer heavy metal panel claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-heavy-metal-panel-claims.html",
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      "topicName": "Emerging biometrics",
      "description": "Blood and urine heavy metal testing, lead exposure, mercury and arsenic panels, chelation claims, and actionability.",
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          "name": "MedlinePlus: Heavy Metal Blood Test",
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        {
          "name": "CDC: Testing for Lead Poisoning in Children",
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        {
          "name": "CDC/NIOSH: Blood Lead Level Guidance",
          "url": "https://www.cdc.gov/niosh/lead/bll-reference/index.html"
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        {
          "name": "CDC: Biomonitoring",
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        {
          "name": "MedlinePlus: Lead Poisoning",
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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        {
          "name": "Specimen matters",
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        },
        {
          "name": "Questions before buying",
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        },
        {
          "name": "When follow-up matters",
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        {
          "name": "When targeted testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heavy-metal-panel-claims.html#when-targeted-testing-matters-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heavy-metal-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heavy-metal-panel-claims.html#related-guides-heading"
        }
      ]
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      "topicName": "Emerging biometrics",
      "description": "Hair testing for minerals and toxic metals, contamination, lab variability, wellness claims, and better-confirmed tests.",
      "sourceTag": "ATSDR + FDA",
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          "name": "PubMed: Clinical Validity of Hair Element Analysis",
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        {
          "name": "PMC: Hair Analysis Critical Review",
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        {
          "name": "MedlinePlus: Heavy Metal Blood Test",
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        },
        {
          "name": "CDC: Biomonitoring",
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        },
        {
          "name": "MedlinePlus: Lead Poisoning",
          "url": "https://medlineplus.gov/leadpoisoning.html"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "Claims to separate",
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        {
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        {
          "name": "When better tests exist",
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        {
          "name": "When targeted testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/hair-mineral-analysis-claims.html#when-targeted-testing-matters-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/hair-mineral-analysis-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/hair-mineral-analysis-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 446,
      "title": "Mold mycotoxin urine test claims",
      "url": "https://mainstreetbloodlab.com/articles/mold-mycotoxin-urine-test-claims.html",
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      "topicName": "Emerging biometrics",
      "description": "Urine mycotoxin panels, indoor mold, CDC cautions, FDA DTC-test limits, and detox claims.",
      "sourceTag": "CDC + FDA",
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          "name": "CDC MMWR: Unvalidated Urine Mycotoxin Tests",
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        {
          "name": "CDC: Mold",
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        {
          "name": "CDC/NIOSH: Mold, Testing, and Remediation",
          "url": "https://www.cdc.gov/niosh/mold/testing-remediation/index.html"
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        {
          "name": "CDC: Protect Your Respiratory Health During Disaster Cleanup",
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        {
          "name": "EPA: A Brief Guide to Mold, Moisture, and Your Home",
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        {
          "name": "FDA: Direct-to-Consumer Tests",
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        {
          "name": "FDA: Mycotoxins",
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          "name": "What the result cannot prove",
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        {
          "name": "What does matter",
          "url": "https://mainstreetbloodlab.com/articles/mold-mycotoxin-urine-test-claims.html#what-does-matter"
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        {
          "name": "When to act",
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/mold-mycotoxin-urine-test-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/mold-mycotoxin-urine-test-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/mold-mycotoxin-urine-test-claims.html#related-guides-heading"
        }
      ]
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      "position": 447,
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      "sourceTag": "FDA + CDC + EPA",
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        {
          "name": "FDA: Total Diet Study",
          "url": "https://www.fda.gov/food/reference-databases-and-monitoring-programs-food/fda-total-diet-study-tds"
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        {
          "name": "FDA: Lead in Food and Foodwares",
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        {
          "name": "FDA: Mercury in Food",
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          "name": "FDA: Chemical Contaminants & Pesticides",
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        {
          "name": "CDC: Biomonitoring",
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          "name": "EPA: Defining Pesticide Biomarkers",
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          "name": "Short answer",
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        {
          "name": "What to separate",
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        },
        {
          "name": "Human biomonitoring versus food testing",
          "url": "https://mainstreetbloodlab.com/articles/food-toxin-contaminant-panel-claims.html#human-biomonitoring-versus-food-testing"
        },
        {
          "name": "When context matters",
          "url": "https://mainstreetbloodlab.com/articles/food-toxin-contaminant-panel-claims.html#when-context-matters"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/food-toxin-contaminant-panel-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/food-toxin-contaminant-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/food-toxin-contaminant-panel-claims.html#related-guides-heading"
        }
      ]
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      "position": 448,
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          "name": "CDC: Biomonitoring Population Exposures",
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          "name": "CDC Archive: Biomonitoring Program",
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          "name": "ATSDR: PFAS and Your Health",
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        {
          "name": "ATSDR: Testing for PFAS",
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        {
          "name": "ATSDR: Screening for PFAS Levels in Your Blood",
          "url": "https://www.atsdr.cdc.gov/pfas/blood-testing/estimating-blood-levels.html"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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          "name": "Short answer",
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          "name": "What PFAS blood testing can and cannot answer",
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          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/pfas-blood-testing-claims.html#questions-to-ask"
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        {
          "name": "When follow-up matters",
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        {
          "name": "What can change next",
          "url": "https://mainstreetbloodlab.com/articles/pfas-blood-testing-claims.html#what-can-change-next"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/pfas-blood-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/pfas-blood-testing-claims.html#related-guides-heading"
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      "position": 449,
      "title": "Consumer pesticide exposure panel claims",
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Urine metabolites, biomonitoring, diet and occupational context, DTC limits, and urgent exposure questions.",
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          "name": "CDC: Biomonitoring Population Exposures",
          "url": "https://www.cdc.gov/environmental-health-tracking/php/data-research/biomonitoring-population-exposures.html"
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        {
          "name": "CDC: National Exposure Report",
          "url": "https://www.cdc.gov/environmental-exposure-report/index.html"
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        {
          "name": "EPA: Defining Pesticide Biomarkers",
          "url": "https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/defining-pesticide-biomarkers"
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        {
          "name": "EPA: Human Health Issues Related to Pesticides",
          "url": "https://www.epa.gov/pesticide-science-and-assessing-pesticide-risks/human-health-issues-related-pesticides"
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        {
          "name": "EPA: Exposure Assessment Tools by Chemical Classes - Pesticides",
          "url": "https://www.epa.gov/expobox/exposure-assessment-tools-chemical-classes-pesticides"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "Short answer",
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        {
          "name": "What biomonitoring can and cannot tell you",
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        {
          "name": "What makes a result useful",
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        {
          "name": "When to seek urgent help",
          "url": "https://mainstreetbloodlab.com/articles/consumer-pesticide-exposure-panel-claims.html#when-to-seek-urgent-help"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-pesticide-exposure-panel-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-pesticide-exposure-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-pesticide-exposure-panel-claims.html#related-guides-heading"
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    {
      "position": 450,
      "title": "Phthalate and BPA urine testing claims",
      "url": "https://mainstreetbloodlab.com/articles/phthalate-bpa-urine-testing-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Urine metabolites, recent exposure, CDC biomonitoring, source reduction, and DTC limits.",
      "sourceTag": "CDC + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC: National Report on Human Exposure to Environmental Chemicals",
          "url": "https://www.cdc.gov/biomonitoring/resources/national-exposure-report.html"
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        {
          "name": "CDC: Biomonitoring Population Exposures",
          "url": "https://www.cdc.gov/environmental-health-tracking/php/data-research/biomonitoring-population-exposures.html"
        },
        {
          "name": "CDC: Biomonitoring Data Tables",
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        },
        {
          "name": "CDC: Biomonitoring",
          "url": "https://www.cdc.gov/biomonitoring/"
        },
        {
          "name": "FDA: Bisphenol A (BPA) Use in Food Contact Application",
          "url": "https://www.fda.gov/food/food-packaging-other-substances-come-contact-food-information-consumers/bisphenol-bpa-use-food-contact-application"
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        {
          "name": "FDA: Phthalates in Food Packaging and Food Contact Applications",
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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      "sections": [
        {
          "name": "Short answer",
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        {
          "name": "What the result can and cannot answer",
          "url": "https://mainstreetbloodlab.com/articles/phthalate-bpa-urine-testing-claims.html#what-the-result-can-and-cannot-answer"
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        {
          "name": "Better next steps",
          "url": "https://mainstreetbloodlab.com/articles/phthalate-bpa-urine-testing-claims.html#better-next-steps"
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        {
          "name": "When follow-up matters",
          "url": "https://mainstreetbloodlab.com/articles/phthalate-bpa-urine-testing-claims.html#when-follow-up-matters"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/phthalate-bpa-urine-testing-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/phthalate-bpa-urine-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/phthalate-bpa-urine-testing-claims.html#related-guides-heading"
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      ]
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    {
      "position": 451,
      "title": "Consumer oxidative stress panel claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxidative-stress-panel-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Free radicals, antioxidant markers, biomarker validity, wellness scores, supplements, and actionability.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
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          "name": "MedlinePlus: Antioxidants",
          "url": "https://medlineplus.gov/antioxidants.html"
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        {
          "name": "NCCIH: Antioxidant Supplements",
          "url": "https://www.nccih.nih.gov/health/antioxidant-supplements-what-you-need-to-know"
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        {
          "name": "NIEHS: Biomarkers",
          "url": "https://www.niehs.nih.gov/health/topics/science/biomarkers"
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        {
          "name": "NCBI Bookshelf: Biomarkers Part II - Antioxidants in Sport Nutrition",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK299050/"
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        {
          "name": "NCBI Bookshelf: Vitamin C, Vitamin E, Selenium, and Beta-Carotene and Other Carotenoids",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK225471/"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "NIH ODS: Dietary Supplements for Exercise and Athletic Performance",
          "url": "https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-Consumer/"
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        {
          "name": "Short answer",
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        {
          "name": "How to evaluate a panel",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxidative-stress-panel-claims.html#how-to-evaluate-a-panel"
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        {
          "name": "Better framing",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxidative-stress-panel-claims.html#better-framing"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxidative-stress-panel-claims.html#questions-to-ask"
        },
        {
          "name": "When the score is the wrong tool",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxidative-stress-panel-claims.html#when-the-score-is-the-wrong-tool"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxidative-stress-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxidative-stress-panel-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 452,
      "title": "Consumer glycation and AGE testing claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-glycation-age-testing-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Skin autofluorescence, advanced glycation end products, A1C context, diabetes risk, and actionability.",
      "sourceTag": "FDA + PubMed",
      "sourceCount": 7,
      "sources": [
        {
          "name": "MedlinePlus: Hemoglobin A1C Test",
          "url": "https://medlineplus.gov/lab-tests/hemoglobin-a1c-hba1c-test/"
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        {
          "name": "NIDDK: The A1C Test & Diabetes",
          "url": "https://www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test"
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        {
          "name": "NIDDK: Diabetes & Prediabetes Tests",
          "url": "https://www.niddk.nih.gov/health-information/diabetes/overview/tests-diagnosis"
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        {
          "name": "PubMed: Advanced Glycation Endproducts by Skin Autofluorescence",
          "url": "https://pubmed.ncbi.nlm.nih.gov/31050947/"
        },
        {
          "name": "PMC: Skin Autofluorescence and Cardiometabolic Risk",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5983078/"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "NIEHS: Biomarkers",
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          "name": "Short answer",
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        {
          "name": "Claims to separate",
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        {
          "name": "Better next steps",
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-glycation-age-testing-claims.html#questions-to-ask"
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        {
          "name": "When the score is the wrong tool",
          "url": "https://mainstreetbloodlab.com/articles/consumer-glycation-age-testing-claims.html#when-the-score-is-the-wrong-tool"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-glycation-age-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-glycation-age-testing-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 453,
      "title": "Consumer mitochondrial function test claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-mitochondrial-function-test-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Lactate, pyruvate, organic acids, fatigue claims, inherited disorders, and wellness-panel limits.",
      "sourceTag": "NIH + FDA",
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          "name": "MedlinePlus: Lactate Test",
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        {
          "name": "GeneReviews: Primary Mitochondrial Disorders Overview",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK1224/"
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        {
          "name": "NINDS: Mitochondrial Disorders",
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        },
        {
          "name": "NINDS: Mitochondrial Disease CDE",
          "url": "https://commondataelements.ninds.nih.gov/Mitochondrial%20Disease"
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        {
          "name": "NINDS Common Data Elements: Mitochondrial Disease Biomarkers Guidance",
          "url": "https://commondataelements.ninds.nih.gov/sites/nindscde/files/Doc/Mito/F3141_Biomarkers_Guidance_Mitochondrial_Disease.pdf"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "NIEHS: Biomarkers",
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        {
          "name": "What the markers can mean",
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        {
          "name": "When medical evaluation matters",
          "url": "https://mainstreetbloodlab.com/articles/consumer-mitochondrial-function-test-claims.html#when-medical-evaluation-matters"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-mitochondrial-function-test-claims.html#questions-to-ask"
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        {
          "name": "When the score is the wrong tool",
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        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-mitochondrial-function-test-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-mitochondrial-function-test-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 454,
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Biological-aging claims, leukocyte telomere limits, lifestyle marketing, and clinical actionability.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
      "sources": [
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          "name": "FDA: Biomarkers and Surrogate Endpoints",
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        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "NCBI Bookshelf: Biomarkers of Aging",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK231470/"
        },
        {
          "name": "PMC: NHANES Telomere Length, Age, and Comorbidities",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC6716670/"
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        {
          "name": "MedlinePlus Genetics: TERT Gene",
          "url": "https://medlineplus.gov/genetics/gene/tert/"
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        {
          "name": "PMC: Biomarkers of Aging: From Function to Molecular Biology",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC4924179/"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "Short answer",
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        {
          "name": "Claims to separate",
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        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-telomere-length-testing-claims.html#what-would-make-it-stronger"
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        {
          "name": "How to interpret it",
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-telomere-length-testing-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-telomere-length-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-telomere-length-testing-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 455,
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      "description": "Extracellular vesicles, cancer-screening claims, liquid biopsy context, FDA cautions, and evidence gaps.",
      "sourceTag": "FDA + NCI",
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      "sources": [
        {
          "name": "FDA: Public Safety Notification on Exosome Products",
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        },
        {
          "name": "FDA: Biomarker Qualification Program",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
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        {
          "name": "NCI: Biomarker Testing for Cancer Treatment",
          "url": "https://www.cancer.gov/about-cancer/treatment/types/biomarker-testing-cancer-treatment"
        },
        {
          "name": "NCI: Definition of liquid biopsy",
          "url": "https://www.cancer.gov/publications/dictionaries/cancer-terms/def/779095"
        },
        {
          "name": "NCI: Tumor Markers Fact Sheet",
          "url": "https://www.cancer.gov/about-cancer/diagnosis-staging/diagnosis/tumor-markers-fact-sheet"
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        {
          "name": "NCI-Funded Researchers Are Using Machine Learning to Identify Exosome Biomarkers",
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        {
          "name": "PMC: Extracellular Vesicles as Cancer Liquid Biopsies",
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          "name": "Short answer",
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          "name": "Claims to separate",
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        {
          "name": "Where exosome science is useful",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exosome-biomarker-testing-claims.html#where-exosome-science-is-useful"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exosome-biomarker-testing-claims.html#questions-to-ask"
        },
        {
          "name": "When the claim needs more proof",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exosome-biomarker-testing-claims.html#when-the-claim-needs-more-proof"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exosome-biomarker-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exosome-biomarker-testing-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 456,
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      "url": "https://mainstreetbloodlab.com/articles/consumer-methylation-panel-claims.html",
      "topic": "biomarkers",
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      "sourceTag": "FDA + MedlinePlus",
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      "sources": [
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          "name": "FDA: Biomarkers and Surrogate Endpoints",
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        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "MedlinePlus Genetics: MTHFR Gene",
          "url": "https://medlineplus.gov/genetics/gene/mthfr/"
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        {
          "name": "NCBI Bookshelf: Biomarkers of Aging",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK231470/"
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          "name": "PMC: DNA Methylation Age of Human Tissues and Cell Types",
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        {
          "name": "PMC: Dynamic DNA Methylation Across Diverse Human Cell Lines and Tissues",
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          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "Short answer",
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        {
          "name": "Claims to separate",
          "url": "https://mainstreetbloodlab.com/articles/consumer-methylation-panel-claims.html#claims-to-separate"
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        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-methylation-panel-claims.html#what-would-make-it-stronger"
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        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-methylation-panel-claims.html#how-to-interpret-it"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-methylation-panel-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-methylation-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-methylation-panel-claims.html#related-guides-heading"
        }
      ]
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      "position": 457,
      "title": "Consumer proteomics testing claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-proteomics-testing-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Blood protein panels, disease-risk scores, organ-age claims, cancer biomarker context, and validation.",
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          "name": "FDA: Biomarkers and Surrogate Endpoints",
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "NCI: Biomarker Testing for Cancer Treatment",
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        {
          "name": "PMC: Plasma Proteomics and Health",
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        {
          "name": "PMC: Plasma Proteome Profiling to detect and avoid sample-related biases in biomarker studies",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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        {
          "name": "Protein Electrophoresis by Immunofixation Blood Test",
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          "name": "Claims to separate",
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        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-proteomics-testing-claims.html#better-framing"
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        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-proteomics-testing-claims.html#how-to-interpret-it"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-proteomics-testing-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-proteomics-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-proteomics-testing-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 458,
      "title": "Consumer lipidomics testing claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-lipidomics-testing-claims.html",
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      "description": "Blood lipid species, risk scores, standard lipid panels, ApoB comparison, and clinical validation.",
      "sourceTag": "NIH + FDA",
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        {
          "name": "MedlinePlus: Cholesterol",
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        {
          "name": "MedlinePlus: Lipoprotein(a) Blood Test",
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        {
          "name": "American Heart Association: ApoB",
          "url": "https://www.heart.org/en/health-topics/cholesterol/how-to-get-your-cholesterol-tested/apolipoprotein-b"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
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        {
          "name": "PMC: Clinical Lipidomics",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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        {
          "name": "Claims to separate",
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        {
          "name": "Better clinical anchors",
          "url": "https://mainstreetbloodlab.com/articles/consumer-lipidomics-testing-claims.html#better-clinical-anchors"
        },
        {
          "name": "What the report cannot prove",
          "url": "https://mainstreetbloodlab.com/articles/consumer-lipidomics-testing-claims.html#what-the-report-cannot-prove"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-lipidomics-testing-claims.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-lipidomics-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-lipidomics-testing-claims.html#related-guides-heading"
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    {
      "position": 459,
      "title": "Consumer organ-age testing claims",
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Blood protein organ clocks, kidney/heart/liver age scores, biological age, and actionability limits.",
      "sourceTag": "NIH + FDA",
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          "name": "Nature: Organ Aging Signatures in the Plasma Proteome",
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        {
          "name": "PMC: Plasma Proteomics and Health",
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        {
          "name": "FDA: Direct-to-Consumer Tests",
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        {
          "name": "FDA: Biomarkers and Surrogate Endpoints",
          "url": "https://www.fda.gov/about-fda/innovation-fda/fda-facts-biomarkers-and-surrogate-endpoints"
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        {
          "name": "NCBI Bookshelf: Biomarkers of Aging",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
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        {
          "name": "CDC: Healthy Aging at Any Age",
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        {
          "name": "Claims to separate",
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        },
        {
          "name": "Better clinical anchors",
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        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-organ-age-testing-claims.html#how-to-interpret-it"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-organ-age-testing-claims.html#questions-to-ask"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-organ-age-testing-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-organ-age-testing-claims.html#related-guides-heading"
        }
      ]
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      "position": 460,
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      "description": "MCED tests, cancer signals, false positives, false negatives, FDA status, and screening limits.",
      "sourceTag": "NCI + FDA",
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          "name": "NCI: What Cancer Screening Tests Check for Cancer?",
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        {
          "name": "NCI: Cancer Screening Overview (PDQ)",
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        {
          "name": "NCI: Questions and Answers about Multi-Cancer Detection Tests",
          "url": "https://prevention.cancer.gov/research-areas/networks-consortia-programs/csrn/q-a-about-mcd-tests"
        },
        {
          "name": "NCI Dictionary: multi-cancer detection test",
          "url": "https://www.cancer.gov/publications/dictionaries/cancer-terms/def/multi-cancer-detection-test"
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
        },
        {
          "name": "FDA: In Vitro Diagnostics",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/in-vitro-diagnostics"
        },
        {
          "name": "NCI: Tumor Markers Fact Sheet",
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        {
          "name": "Claims to separate",
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        {
          "name": "What still needs proof",
          "url": "https://mainstreetbloodlab.com/articles/multi-cancer-early-detection-blood-test-claims.html#what-still-needs-proof"
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        {
          "name": "What a cautious consumer should check",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/multi-cancer-early-detection-blood-test-claims.html#faq"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/multi-cancer-early-detection-blood-test-claims.html#questions-to-ask"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/multi-cancer-early-detection-blood-test-claims.html#related-guides-heading"
        }
      ]
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      "position": 461,
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      "description": "p-tau217, amyloid ratios, symptomatic use, screening limits, and clinical follow-up.",
      "sourceTag": "FDA + NIH + NIA",
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      "sources": [
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
        },
        {
          "name": "FDA: FDA Clears First Blood Test Used in Diagnosing Alzheimer's Disease",
          "url": "https://www.fda.gov/news-events/press-announcements/fda-clears-first-blood-test-used-diagnosing-alzheimers-disease"
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        {
          "name": "NIH: Accurate blood test for Alzheimer's disease",
          "url": "https://www.nih.gov/news-events/nih-research-matters/accurate-blood-test-alzheimer-s-disease"
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        {
          "name": "NIH: Blood test predicts start of Alzheimer's disease symptoms",
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        {
          "name": "NIH: Diagnosing dementia",
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        {
          "name": "NIA: What happens to the brain in Alzheimer's disease?",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "url": "https://mainstreetbloodlab.com/articles/consumer-alzheimers-blood-biomarker-test-claims.html#short-answer"
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        {
          "name": "What the tests measure",
          "url": "https://mainstreetbloodlab.com/articles/consumer-alzheimers-blood-biomarker-test-claims.html#what-the-tests-measure"
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        {
          "name": "Claims to separate",
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        {
          "name": "Why symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-alzheimers-blood-biomarker-test-claims.html#why-symptoms-matter"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-alzheimers-blood-biomarker-test-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-alzheimers-blood-biomarker-test-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-alzheimers-blood-biomarker-test-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 462,
      "title": "Consumer cancer methylation blood test claims",
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      "topicName": "Emerging biometrics",
      "description": "cfDNA methylation, MCED screening limits, positive follow-up, and why standard screening still matters.",
      "sourceTag": "NCI + FDA",
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          "name": "NCI: Questions and Answers about Multi-Cancer Detection Tests",
          "url": "https://prevention.cancer.gov/research-areas/networks-consortia-programs/csrn/q-a-about-mcd-tests"
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        {
          "name": "NCI: What Cancer Screening Tests Check for Cancer?",
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        {
          "name": "NCI: Cancer Screening Overview (PDQ)",
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        {
          "name": "NCI Dictionary: multi-cancer detection test",
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        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "FDA: In Vitro Diagnostics",
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        {
          "name": "NCI: Tumor Markers Fact Sheet",
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          "name": "What the tests measure",
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        {
          "name": "Claims to separate",
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        {
          "name": "What a cautious consumer should check",
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cancer-methylation-blood-test-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cancer-methylation-blood-test-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cancer-methylation-blood-test-claims.html#related-guides-heading"
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      ]
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      "sourceTag": "NIDDK + CDC + USPSTF",
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        {
          "name": "NIDDK: Recommended Tests for Identifying Prediabetes",
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          "name": "CDC: Diabetes Testing",
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          "name": "USPSTF: Screening for Prediabetes and Type 2 Diabetes",
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          "name": "PubMed: Surrogate markers of insulin resistance: A review",
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        {
          "name": "PMC: Lipoprotein Insulin Resistance Index",
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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        {
          "name": "What the scores measure",
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        {
          "name": "What changes diagnosis",
          "url": "https://mainstreetbloodlab.com/articles/consumer-insulin-resistance-score-claims.html#what-changes-diagnosis"
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        {
          "name": "What makes the result actionable",
          "url": "https://mainstreetbloodlab.com/articles/consumer-insulin-resistance-score-claims.html#what-makes-the-result-actionable"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-insulin-resistance-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-insulin-resistance-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-insulin-resistance-score-claims.html#related-guides-heading"
        }
      ]
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    {
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      "topic": "biomarkers",
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          "name": "MedlinePlus: Cortisol Blood Test",
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          "name": "MedlinePlus: Cortisol Urine Test",
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          "name": "NIDDK: Adrenal Insufficiency and Addison's Disease",
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        {
          "name": "Endocrine Society: Diagnosis of Cushing's Syndrome",
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        {
          "name": "MedlinePlus: Adrenal Gland Disorders",
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        {
          "name": "Separate the medical test from the wellness score",
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        },
        {
          "name": "When cortisol testing is more medical",
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        {
          "name": "What the score cannot prove",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cortisol-stress-score-claims.html#what-the-score-cannot-prove"
        },
        {
          "name": "What clinicians may order next",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cortisol-stress-score-claims.html#what-clinicians-may-order-next"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cortisol-stress-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cortisol-stress-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cortisol-stress-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 465,
      "title": "Consumer metabolic age score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "BIA scales, resting metabolic rate, body composition estimates, reference populations, and actionability limits.",
      "sourceTag": "NIDDK + FDA",
      "sourceCount": 7,
      "sources": [
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          "name": "MedlinePlus: Obesity Screening",
          "url": "https://medlineplus.gov/lab-tests/obesity-screening"
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        {
          "name": "NIDDK: Human Energy & Body Weight Regulation Core",
          "url": "https://www.niddk.nih.gov/research-funding/at-niddk/cores-support-services/human-energy-body-weight-regulation-core"
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        {
          "name": "NIDDK: Metabolic Testing",
          "url": "https://www.niddk.nih.gov/research-funding/at-niddk/labs-branches/diabetes-endocrinology-obesity-branch/metabolic-clinical-research-unit/metabolic-testing"
        },
        {
          "name": "NIH Technology Assessment Conference Statement: Bioelectrical impedance analysis in body composition measurement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/8780375/"
        },
        {
          "name": "FDA 510(k) Summary: InBody 230 Body Composition Analyzer",
          "url": "https://www.accessdata.fda.gov/cdrh_docs/pdf6/K062603.pdf"
        },
        {
          "name": "FDA 510(k) Summary: TANITA Body Fat Analyzer / Body Composition Monitor",
          "url": "https://www.accessdata.fda.gov/cdrh_docs/pdf/k014009.pdf"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
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      "sections": [
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html#short-answer"
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        {
          "name": "What the score may be built from",
          "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html#what-the-score-may-be-built-from"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html#how-to-interpret-it"
        },
        {
          "name": "What is more actionable",
          "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html#what-is-more-actionable"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-metabolic-age-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 466,
      "title": "Consumer biological resilience score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Aging biomarkers, recovery claims, stress response, biological age, blood proteins, and validation limits.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "PubMed: How to Measure Biological Aging in Humans",
          "url": "https://pubmed.ncbi.nlm.nih.gov/40011691/"
        },
        {
          "name": "PMC: Validation of Biomarkers of Aging",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11090477/"
        },
        {
          "name": "PMC: Biological Age Predictors",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5514388/"
        },
        {
          "name": "NCBI Bookshelf: Biomarkers of Aging",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK231470/"
        },
        {
          "name": "FDA: Biomarkers and Surrogate Endpoints",
          "url": "https://www.fda.gov/about-fda/innovation-fda/fda-facts-biomarkers-and-surrogate-endpoints"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html#short-answer"
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        {
          "name": "Claims to separate",
          "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html#claims-to-separate"
        },
        {
          "name": "What would make it more credible",
          "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html#what-would-make-it-more-credible"
        },
        {
          "name": "What it cannot prove",
          "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html#what-it-cannot-prove"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-biological-resilience-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 467,
      "title": "Consumer immune age score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Inflammaging, blood proteins, immune cells, biological age, immune resilience, and validation limits.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
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        {
          "name": "PubMed: Long-Lived Immune System of Centenarians",
          "url": "https://pubmed.ncbi.nlm.nih.gov/42026253/"
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        {
          "name": "Immunological Biomarkers of Aging Review",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12123219/"
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        {
          "name": "MedlinePlus: Complete Blood Count (CBC)",
          "url": "https://medlineplus.gov/lab-tests/complete-blood-count-cbc"
        },
        {
          "name": "MedlinePlus: C-Reactive Protein (CRP) Test",
          "url": "https://medlineplus.gov/lab-tests/c-reactive-protein-crp-test/"
        },
        {
          "name": "MedlinePlus: Healthy Sleep",
          "url": "https://medlineplus.gov/healthysleep.html"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html#short-answer"
        },
        {
          "name": "What the score may be trying to capture",
          "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html#what-the-score-may-be-trying-to-capture"
        },
        {
          "name": "Why this is not the same as immune function testing",
          "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html#why-this-is-not-the-same-as-immune-function-testing"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html#how-to-interpret-it"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-immune-age-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 468,
      "title": "Consumer healthspan score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Biomarkers, biological age, fitness, wearables, validation, actionability, and wellness-claim limits.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "FDA: Biomarkers and Surrogate Endpoints",
          "url": "https://www.fda.gov/about-fda/innovation-fda/fda-facts-biomarkers-and-surrogate-endpoints"
        },
        {
          "name": "FDA: General Wellness Policy for Low Risk Devices",
          "url": "https://www.fda.gov/regulatory-information/search-fda-guidance-documents/general-wellness-policy-low-risk-devices"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
        },
        {
          "name": "NCBI Bookshelf: Biomarkers of Aging",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK231470/"
        },
        {
          "name": "PMC: Validation of Biomarkers of Aging",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11090477/"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
        },
        {
          "name": "CDC: Healthy Aging at Any Age",
          "url": "https://www.cdc.gov/healthy-aging/about/index.html"
        }
      ],
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      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html#short-answer"
        },
        {
          "name": "What to separate",
          "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html#what-to-separate"
        },
        {
          "name": "What would make a score stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html#what-would-make-a-score-stronger"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html#how-to-interpret-it"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-healthspan-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 469,
      "title": "Consumer longevity supplement panel claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "NAD, methylation, nutrients, inflammation, supplement recommendations, and evidence limits.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCCIH: Using Dietary Supplements Wisely",
          "url": "https://www.nccih.nih.gov/health/using-dietary-supplements-wisely"
        },
        {
          "name": "NIH ODS: Dietary Supplements: What You Need to Know",
          "url": "https://ods.od.nih.gov/factsheets/WYNTK-Consumer/"
        },
        {
          "name": "FDA: Questions and Answers on Dietary Supplements",
          "url": "https://www.fda.gov/food/information-consumers-using-dietary-supplements/questions-and-answers-dietary-supplements"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
        },
        {
          "name": "MedlinePlus: Vitamin B12 Level",
          "url": "https://medlineplus.gov/ency/article/003705.htm"
        },
        {
          "name": "CDC: Healthy Aging at Any Age",
          "url": "https://www.cdc.gov/healthy-aging/about/index.html"
        }
      ],
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        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html#short-answer"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html#how-to-judge-the-claim"
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        {
          "name": "Conflict-of-interest check",
          "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html#conflict-of-interest-check"
        },
        {
          "name": "What the panel cannot prove",
          "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html#what-the-panel-cannot-prove"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-longevity-supplement-panel-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 470,
      "title": "Consumer frailty score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-frailty-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Grip strength, gait speed, wearables, biomarkers, aging risk, function, and validation limits.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC STEADI: Older Adult Fall Prevention",
          "url": "https://www.cdc.gov/steadi/"
        },
        {
          "name": "PMC: Frailty in Older Adults Review",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC6224783/"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
        },
        {
          "name": "FDA: Biomarkers and Surrogate Endpoints",
          "url": "https://www.fda.gov/about-fda/innovation-fda/fda-facts-biomarkers-and-surrogate-endpoints"
        },
        {
          "name": "NCBI Bookshelf: Biomarkers of Aging",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK231470/"
        },
        {
          "name": "PMC: Validation of Biomarkers of Aging",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11090477/"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
        }
      ],
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      "sections": [
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          "name": "Short answer",
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        },
        {
          "name": "Signals that may matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-frailty-score-claims.html#signals-that-may-matter"
        },
        {
          "name": "What to be cautious about",
          "url": "https://mainstreetbloodlab.com/articles/consumer-frailty-score-claims.html#what-to-be-cautious-about"
        },
        {
          "name": "How to use it wisely",
          "url": "https://mainstreetbloodlab.com/articles/consumer-frailty-score-claims.html#how-to-use-it-wisely"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-frailty-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-frailty-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-frailty-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 471,
      "title": "Consumer recovery supplement stack claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Readiness scores, HRV, inflammation, creatine, protein, electrolytes, supplement safety, and evidence.",
      "sourceTag": "NIH + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NIH ODS: Dietary Supplements for Exercise and Athletic Performance",
          "url": "https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-Consumer/"
        },
        {
          "name": "NCCIH: Using Dietary Supplements Wisely",
          "url": "https://www.nccih.nih.gov/health/using-dietary-supplements-wisely"
        },
        {
          "name": "FDA: Questions and Answers on Dietary Supplements",
          "url": "https://www.fda.gov/food/information-consumers-using-dietary-supplements/questions-and-answers-dietary-supplements"
        },
        {
          "name": "MedlinePlus: Healthy Sleep",
          "url": "https://medlineplus.gov/healthysleep.html"
        },
        {
          "name": "MedlinePlus: Creatine Kinase",
          "url": "https://medlineplus.gov/lab-tests/creatine-kinase/"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
        }
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#short-answer"
        },
        {
          "name": "Claims to separate",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#claims-to-separate"
        },
        {
          "name": "Safety checks matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#safety-checks-matter"
        },
        {
          "name": "What the stack cannot prove",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#what-the-stack-cannot-prove"
        },
        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#what-would-make-it-stronger"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-supplement-stack-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 472,
      "title": "Consumer overtraining score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "HRV, cortisol, CK, sleep, performance, inflammation, recovery metrics, and evidence limits.",
      "sourceTag": "NIH + MedlinePlus",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NIH ODS: Dietary Supplements for Exercise and Athletic Performance",
          "url": "https://ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-Consumer/"
        },
        {
          "name": "MedlinePlus: Creatine Kinase",
          "url": "https://medlineplus.gov/lab-tests/creatine-kinase/"
        },
        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
          "url": "https://www.nhlbi.nih.gov/health/sleep-deprivation/health-effects"
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        {
          "name": "PubMed: Diagnosing Overtraining Syndrome: A Scoping Review",
          "url": "https://pubmed.ncbi.nlm.nih.gov/34496702/"
        },
        {
          "name": "PubMed: Training and overtraining: an overview and experimental results in endurance sports",
          "url": "https://pubmed.ncbi.nlm.nih.gov/9190120/"
        },
        {
          "name": "AASM: Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29734997/"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html#short-answer"
        },
        {
          "name": "Signals to separate",
          "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html#signals-to-separate"
        },
        {
          "name": "What would make the score useful",
          "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html#what-would-make-the-score-useful"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html#questions-to-ask"
        },
        {
          "name": "When to get checked",
          "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html#when-to-get-checked"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-overtraining-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 473,
      "title": "Consumer sleep debt score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, sleep duration, circadian timing, recovery, sleep quality, and validation limits.",
      "sourceTag": "NHLBI + MedlinePlus + CDC",
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        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
          "url": "https://www.nhlbi.nih.gov/health/sleep-deprivation"
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        {
          "name": "NHLBI: Sleep Studies",
          "url": "https://www.nhlbi.nih.gov/health/sleep-studies"
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        {
          "name": "MedlinePlus: Healthy Sleep",
          "url": "https://medlineplus.gov/healthysleep.html"
        },
        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study"
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        {
          "name": "MedlinePlus: Sleep Disorders",
          "url": "https://medlineplus.gov/sleepdisorders.html"
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        {
          "name": "CDC: About Sleep",
          "url": "https://www.cdc.gov/sleep/about/index.html"
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        {
          "name": "American Academy of Sleep Medicine: Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29734997/"
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          "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html#short-answer"
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        {
          "name": "What the score may be using",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html#what-the-score-may-be-using"
        },
        {
          "name": "Where it can mislead",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html#where-it-can-mislead"
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        {
          "name": "When medical evaluation matters",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html#when-medical-evaluation-matters"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sleep-debt-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 474,
      "title": "Consumer circadian rhythm score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, sleep timing, light exposure, chronotype, temperature rhythms, and validation limits.",
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      "sourceCount": 7,
      "sources": [
        {
          "name": "NHLBI: Sleep Studies",
          "url": "https://www.nhlbi.nih.gov/health/sleep-studies"
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        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
          "url": "https://www.nhlbi.nih.gov/health/sleep-deprivation"
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        {
          "name": "CDC: About Sleep",
          "url": "https://www.cdc.gov/sleep/about/index.html"
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        {
          "name": "MedlinePlus: Healthy Sleep",
          "url": "https://medlineplus.gov/healthysleep.html"
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        {
          "name": "PubMed: Commercial wearables for circadian rhythm home monitoring",
          "url": "https://pubmed.ncbi.nlm.nih.gov/39348247/"
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        {
          "name": "American Academy of Sleep Medicine: Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29734997/"
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        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html#short-answer"
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        {
          "name": "What the score may use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html#what-the-score-may-use"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html#what-the-score-cannot-tell-you"
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        {
          "name": "How to use it wisely",
          "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html#how-to-use-it-wisely"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-circadian-rhythm-score-claims.html#related-guides-heading"
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    {
      "position": 475,
      "title": "Consumer nervous system balance score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-nervous-system-balance-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "HRV, sympathetic and parasympathetic signals, stress scores, recovery, symptoms, and caveats.",
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      "sourceCount": 7,
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        {
          "name": "PMC: Heart rate variability overview and interpretation",
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        {
          "name": "MedlinePlus: Autonomic Testing",
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        {
          "name": "MedlinePlus: Healthy Sleep",
          "url": "https://medlineplus.gov/healthysleep.html"
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        {
          "name": "AASM: Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29734997/"
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        {
          "name": "PubMed: Phone PPG HRV Validation During Biofeedback",
          "url": "https://pubmed.ncbi.nlm.nih.gov/37678565/"
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        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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          "name": "Short answer",
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        {
          "name": "What the score may be summarizing",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nervous-system-balance-score-claims.html#what-the-score-may-be-summarizing"
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        {
          "name": "How to use it without over-believing it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nervous-system-balance-score-claims.html#how-to-use-it-without-over-believing-it"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nervous-system-balance-score-claims.html#questions-to-ask"
        },
        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nervous-system-balance-score-claims.html#what-would-make-it-stronger"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nervous-system-balance-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nervous-system-balance-score-claims.html#related-guides-heading"
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    {
      "position": 476,
      "title": "Consumer jet lag score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, time zones, circadian timing, sleep debt, light exposure, and travel recovery limits.",
      "sourceTag": "CDC + NHLBI",
      "sourceCount": 7,
      "sources": [
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          "name": "CDC Yellow Book: Jet Lag",
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        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
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        {
          "name": "MedlinePlus: Healthy Sleep",
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        {
          "name": "PubMed: Commercial wearables for circadian rhythm home monitoring",
          "url": "https://pubmed.ncbi.nlm.nih.gov/39348247/"
        },
        {
          "name": "PubMed: Predicting circadian phase across populations",
          "url": "https://pubmed.ncbi.nlm.nih.gov/34013347/"
        },
        {
          "name": "American Academy of Sleep Medicine: Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29734997/"
        },
        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html#short-answer"
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        {
          "name": "What a score may combine",
          "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html#what-a-score-may-combine"
        },
        {
          "name": "When it is useful",
          "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html#when-it-is-useful"
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        {
          "name": "How to use it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html#how-to-use-it"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-jet-lag-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 477,
      "title": "Consumer vagal tone score claims",
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "HRV, parasympathetic activity, breathing, recovery, dysautonomia caveats, and validation limits.",
      "sourceTag": "NCBI + PMC",
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          "name": "NCBI Bookshelf: Physiology, Autonomic Nervous System",
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        {
          "name": "PMC: Heart rate variability overview and interpretation",
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        {
          "name": "MedlinePlus: Autonomic Testing",
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        {
          "name": "MedlinePlus: Healthy Sleep",
          "url": "https://medlineplus.gov/healthysleep.html"
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        {
          "name": "AASM: Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29734997/"
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        {
          "name": "PubMed: Phone PPG HRV Validation During Biofeedback",
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        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#short-answer"
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        {
          "name": "What the score is usually borrowing from",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#what-the-score-is-usually-borrowing-from"
        },
        {
          "name": "How to use it without overreach",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#how-to-use-it-without-overreach"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#what-the-score-cannot-tell-you"
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        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#what-would-make-it-stronger"
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        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-vagal-tone-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 478,
      "title": "Consumer breathwork score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-breathwork-score-claims.html",
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      "sources": [
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          "name": "PMC: HRV Biofeedback Methods Review",
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        {
          "name": "PMC: Slow Breathing Systematic Review",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC6137615/"
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        {
          "name": "PubMed: Phone PPG HRV Validation During Biofeedback",
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        {
          "name": "NCCIH: Stress",
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        {
          "name": "NCCIH: Meditation and Mindfulness",
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        {
          "name": "MedlinePlus: Autonomic Testing",
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        {
          "name": "MedlinePlus: Breathing Exercises",
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          "name": "Short answer",
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        {
          "name": "What the score may reward",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathwork-score-claims.html#what-the-score-may-reward"
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        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathwork-score-claims.html#what-the-score-cannot-tell-you"
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        {
          "name": "How to use it wisely",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathwork-score-claims.html#how-to-use-it-wisely"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathwork-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathwork-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathwork-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 479,
      "title": "Consumer recovery age score claims",
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      "sourceTag": "FDA + NIH + MedlinePlus",
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      "sources": [
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          "name": "FDA: About Biomarkers and Qualification",
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        {
          "name": "PubMed: How to Measure Biological Aging in Humans",
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        {
          "name": "PMC: Wearable Readiness Scores and Self-Reported Wellbeing",
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        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
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        {
          "name": "MedlinePlus: Healthy Sleep",
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        {
          "name": "MedlinePlus: Stress",
          "url": "https://medlineplus.gov/stress.html"
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        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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        {
          "name": "Short answer",
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-age-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-age-score-claims.html#how-to-interpret-it"
        },
        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-age-score-claims.html#what-would-make-it-stronger"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-age-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-age-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-age-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 480,
      "title": "Consumer meditation score claims",
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      "topic": "biomarkers",
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      "sourceCount": 7,
      "sources": [
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          "name": "PMC: HRV Biofeedback Methods Review",
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        {
          "name": "PMC: Slow Breathing Systematic Review",
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        {
          "name": "PubMed: Phone PPG HRV Validation During Biofeedback",
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        {
          "name": "NCCIH: Meditation and Mindfulness",
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        {
          "name": "NCCIH: Stress",
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        {
          "name": "MedlinePlus: Autonomic Testing",
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        {
          "name": "NCBI Bookshelf: Physiology, Autonomic Nervous System",
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          "name": "Short answer",
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-meditation-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-meditation-score-claims.html#how-to-interpret-it"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-meditation-score-claims.html#what-the-score-cannot-tell-you"
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        {
          "name": "What would make it stronger",
          "url": "https://mainstreetbloodlab.com/articles/consumer-meditation-score-claims.html#what-would-make-it-stronger"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-meditation-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-meditation-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-meditation-score-claims.html#related-guides-heading"
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    {
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      "title": "Consumer cognitive readiness score claims",
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      "topic": "biomarkers",
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      "sourceTag": "FDA + NHLBI",
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      "sources": [
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          "name": "FDA: About Biomarkers and Qualification",
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        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
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        {
          "name": "CDC: About Sleep",
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        {
          "name": "MedlinePlus: Sleep Disorders",
          "url": "https://medlineplus.gov/sleepdisorders.html"
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        {
          "name": "PMC: Wearable Readiness Scores and Self-Reported Wellbeing",
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        {
          "name": "National Institute on Aging: Cognitive Health and Older Adults",
          "url": "https://www.nia.nih.gov/health/brain-health/cognitive-health-and-older-adults"
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        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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          "name": "Short answer",
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cognitive-readiness-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cognitive-readiness-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "How to use it wisely",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cognitive-readiness-score-claims.html#how-to-use-it-wisely"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cognitive-readiness-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cognitive-readiness-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-cognitive-readiness-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 482,
      "title": "Consumer focus score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Attention apps, sleep, HRV, reaction time, caffeine, wearables, and validation limits.",
      "sourceTag": "FDA + NHLBI + MedlinePlus",
      "sourceCount": 7,
      "sources": [
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "CDC: About Sleep",
          "url": "https://www.cdc.gov/sleep/about/index.html"
        },
        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
          "url": "https://www.nhlbi.nih.gov/health/sleep-deprivation/health-effects"
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        {
          "name": "NIMH: ADHD in Adults",
          "url": "https://www.nimh.nih.gov/health/publications/adhd-in-adults-4-things-to-know"
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        {
          "name": "MedlinePlus: Stress",
          "url": "https://medlineplus.gov/stress.html"
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        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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        {
          "name": "PMC: Wearable Readiness Scores and Self-Reported Wellbeing",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12944331/"
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      "sections": [
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html#short-answer"
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to judge a claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html#how-to-judge-a-claim"
        },
        {
          "name": "When to get care",
          "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html#when-to-get-care"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-focus-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 483,
      "title": "Consumer caffeine metabolism score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-caffeine-metabolism-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "CYP1A2, ADORA2A, sleep, anxiety, blood pressure, and genetic testing limits.",
      "sourceTag": "NIH + MedlinePlus",
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        {
          "name": "MedlinePlus: Caffeine",
          "url": "https://medlineplus.gov/caffeine.html"
        },
        {
          "name": "MedlinePlus: Caffeine in the diet",
          "url": "https://medlineplus.gov/ency/article/002445.htm"
        },
        {
          "name": "NCBI Gene: CYP1A2",
          "url": "https://www.ncbi.nlm.nih.gov/gene/1544"
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        {
          "name": "FDA: Spilling the Beans - How Much Caffeine is Too Much?",
          "url": "https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much"
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        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
          "url": "https://www.nhlbi.nih.gov/health/sleep-deprivation"
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        {
          "name": "PubMed: Caffeine Intake and CYP1A2 Genotype",
          "url": "https://pubmed.ncbi.nlm.nih.gov/20192990/"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
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          "name": "Short answer",
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-caffeine-metabolism-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-caffeine-metabolism-score-claims.html#how-to-interpret-it"
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        {
          "name": "When to be careful",
          "url": "https://mainstreetbloodlab.com/articles/consumer-caffeine-metabolism-score-claims.html#when-to-be-careful"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-caffeine-metabolism-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-caffeine-metabolism-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-caffeine-metabolism-score-claims.html#related-guides-heading"
        }
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    {
      "position": 484,
      "title": "Consumer nootropic panel claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Brain supplements, nutrient tests, genetics, focus scores, FDA label claims, and evidence limits.",
      "sourceTag": "FDA + NCCIH",
      "sourceCount": 7,
      "sources": [
        {
          "name": "FDA: Label Claims for Food and Dietary Supplements",
          "url": "https://www.fda.gov/food/labeling-nutrition/label-claims"
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        {
          "name": "FDA: Questions and Answers on Dietary Supplements",
          "url": "https://www.fda.gov/food/information-consumers-using-dietary-supplements/questions-and-answers-dietary-supplements"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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        {
          "name": "NCCIH: Using Dietary Supplements Wisely",
          "url": "https://www.nccih.nih.gov/health/using-dietary-supplements-wisely"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
        },
        {
          "name": "MedlinePlus: Vitamin B12 Level",
          "url": "https://medlineplus.gov/lab-tests/vitamin-b12-level/"
        },
        {
          "name": "National Institute on Aging: Cognitive Health and Older Adults",
          "url": "https://www.nia.nih.gov/health/brain-health/cognitive-health-and-older-adults"
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      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html#short-answer"
        },
        {
          "name": "What may be inside the panel",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html#what-may-be-inside-the-panel"
        },
        {
          "name": "How to judge a claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html#how-to-judge-a-claim"
        },
        {
          "name": "What the panel cannot prove",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html#what-the-panel-cannot-prove"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-nootropic-panel-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 485,
      "title": "Consumer hydration readiness score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, sweat, urine, electrolytes, dehydration, sodium, and validation limits.",
      "sourceTag": "MedlinePlus + FDA",
      "sourceCount": 7,
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        {
          "name": "MedlinePlus: Dehydration",
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        },
        {
          "name": "MedlinePlus: Dehydration (Medical Encyclopedia)",
          "url": "https://medlineplus.gov/ency/article/000982.htm"
        },
        {
          "name": "CDC: Heat-related Illnesses",
          "url": "https://www.cdc.gov/niosh/heat-stress/about/illnesses.html"
        },
        {
          "name": "CDC: Clinical Overview of Heat",
          "url": "https://www.cdc.gov/heat-health/index.html"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "PMC: Wearable Sweat Sensors",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9460306/"
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        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
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      "sections": [
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html#short-answer"
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html#how-to-interpret-it"
        },
        {
          "name": "When the score is not enough",
          "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html#when-the-score-is-not-enough"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-hydration-readiness-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 486,
      "title": "Consumer respiratory fitness score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-fitness-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, respiratory rate, oxygen saturation, VO2 max estimates, exercise capacity, and validation limits.",
      "sourceTag": "FDA + NIH",
      "sourceCount": 7,
      "sources": [
        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
        },
        {
          "name": "NHLBI: Pulmonary Function Tests",
          "url": "https://www.nhlbi.nih.gov/science/pulmonary-function-lab/tests"
        },
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "FDA: Pulse Oximeters for Medical Purposes - Non-Clinical and Clinical Performance Testing, Labeling, and Premarket Submission Recommendations",
          "url": "https://www.fda.gov/media/184896/download"
        },
        {
          "name": "PMC: Validity of Consumer Wearable VO2 Max Estimates",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9213394/"
        },
        {
          "name": "PMC: Cardiorespiratory Fitness in Cardiovascular Disease Prevention",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11269081/"
        },
        {
          "name": "PMC: Free-Living Wearable Cardiorespiratory Fitness Estimation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12841865/"
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        {
          "name": "Short answer",
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-fitness-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "Why it can mislead",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-fitness-score-claims.html#why-it-can-mislead"
        },
        {
          "name": "What matters more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-fitness-score-claims.html#what-matters-more-than-the-score"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-fitness-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-fitness-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-fitness-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 487,
      "title": "Consumer autonomic age score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "HRV, autonomic balance, wearable age scores, recovery claims, and clinical caveats.",
      "sourceTag": "FDA + NIH",
      "sourceCount": 7,
      "sources": [
        {
          "name": "MedlinePlus: Autonomic Testing",
          "url": "https://medlineplus.gov/lab-tests/autonomic-testing"
        },
        {
          "name": "MedlinePlus: Autonomic Nervous System Disorders",
          "url": "https://medlineplus.gov/autonomicnervoussystemdisorders.html"
        },
        {
          "name": "NIDDK: Autonomic Neuropathy",
          "url": "https://www.niddk.nih.gov/health-information/diabetes/overview/preventing-problems/nerve-damage-diabetic-neuropathies/autonomic-neuropathy"
        },
        {
          "name": "NCBI Bookshelf: Wearable Devices for Heart Rate and Heart Rate Variability",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9695982/"
        },
        {
          "name": "PMC: Machine Learning to Estimate Age From Autonomic Cardiovascular Function",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9899796/"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "NCBI Bookshelf: Physiology, Autonomic Nervous System",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK538516/"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#short-answer"
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        {
          "name": "What the score may use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#what-the-score-may-use"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#when-symptoms-matter"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#questions-to-ask"
        },
        {
          "name": "When clinical testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#when-clinical-testing-matters-more"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-autonomic-age-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 488,
      "title": "Consumer recovery debt score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-debt-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, HRV, sleep debt, training load, readiness, fatigue, and validation limits.",
      "sourceTag": "FDA + PMC + MedlinePlus",
      "sourceCount": 7,
      "sources": [
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "NHLBI: Sleep Deprivation and Deficiency",
          "url": "https://www.nhlbi.nih.gov/health/sleep-deprivation"
        },
        {
          "name": "MedlinePlus: Sleep Study",
          "url": "https://medlineplus.gov/lab-tests/sleep-study/"
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        {
          "name": "PMC: HRV, Training Adaptation, and Recovery Monitoring",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12787763/"
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        {
          "name": "PMC: Wearable Readiness Scores and Self-Reported Wellbeing",
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        {
          "name": "Systematic Review: Wearable Devices and HRV Accuracy",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29668452/"
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        {
          "name": "Scoping Review: Wearable Devices to Monitor Recovery",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8988014/"
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          "name": "Short answer",
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-debt-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to interpret it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-debt-score-claims.html#how-to-interpret-it"
        },
        {
          "name": "When to pause and reassess",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-debt-score-claims.html#when-to-pause-and-reassess"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-debt-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-debt-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-debt-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 489,
      "title": "Consumer training age score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-training-age-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Fitness age, VO2 max estimates, training load, age-like labels, and validation limits.",
      "sourceTag": "FDA + PMC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
        },
        {
          "name": "Systematic Review: Accuracy of Wearables for VO2max and Lactate Threshold",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12748164/"
        },
        {
          "name": "Validity of smartwatch-derived estimates of lactate threshold heart rate and pace compared to graded exercise testing",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12309276/"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
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        {
          "name": "CDC: Physical Activity Basics",
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      "sections": [
        {
          "name": "Short answer",
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        },
        {
          "name": "What the score may mix",
          "url": "https://mainstreetbloodlab.com/articles/consumer-training-age-score-claims.html#what-the-score-may-mix"
        },
        {
          "name": "What a valid claim should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-training-age-score-claims.html#what-a-valid-claim-should-disclose"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-training-age-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-training-age-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-training-age-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-training-age-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 490,
      "title": "Consumer strain score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, HRV, training load, stress, recovery, and validation limits.",
      "sourceTag": "FDA + PMC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "PMC: Wearable Readiness Scores and Self-Reported Wellbeing",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12944331/"
        },
        {
          "name": "PMC: Heart rate variability overview and interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5624990/"
        },
        {
          "name": "PMC: HRV, Training Adaptation, and Recovery Monitoring",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12787763/"
        },
        {
          "name": "PubMed: Can Wearable Devices Accurately Measure Heart Rate Variability? A Systematic Review",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29668452/"
        },
        {
          "name": "Validation of Six Wearable Devices for Sleep, Heart Rate, and HRV",
          "url": "https://pubmed.ncbi.nlm.nih.gov/36016077/"
        },
        {
          "name": "PMC: Training load and injury-risk modeling limits",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5981295/"
        }
      ],
      "sectionCount": 9,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#short-answer"
        },
        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "When to back off",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#when-to-back-off"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-strain-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 491,
      "title": "Consumer load management score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Training load, recovery, wearable advice, injury-risk language, and validation limits.",
      "sourceTag": "FDA + PMC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Exercise Physiology",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK482280/"
        },
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "PMC: Training load and injury-risk modeling limits",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5981295/"
        },
        {
          "name": "PMC: HRV, Training Adaptation, and Recovery Monitoring",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12787763/"
        },
        {
          "name": "Validation of Six Wearable Devices for Sleep, Heart Rate, and HRV",
          "url": "https://pubmed.ncbi.nlm.nih.gov/36016077/"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
        }
      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html#short-answer"
        },
        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms or pain matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html#when-symptoms-or-pain-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-load-management-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 492,
      "title": "Consumer exertion tolerance score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, VO2 max estimates, heart rate, fatigue, recovery, symptoms, and validation limits.",
      "sourceTag": "FDA + PMC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
        },
        {
          "name": "NHLBI: Pulmonary Function Tests",
          "url": "https://www.nhlbi.nih.gov/science/pulmonary-function-lab/tests"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "PMC: Wearable VO2 max and cardiorespiratory fitness estimates",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9718831/"
        },
        {
          "name": "American Heart Association: Warning Signs of a Heart Attack",
          "url": "https://www.heart.org/en/health-topics/heart-attack/warning-signs-of-a-heart-attack"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
        }
      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html#short-answer"
        },
        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "What symptoms override the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html#what-symptoms-override-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-exertion-tolerance-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 493,
      "title": "Consumer illness risk score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Temperature, HRV, respiratory rate, sleep, symptom prompts, clinical testing caveats, and validation limits.",
      "sourceTag": "FDA + PMC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC: Signs and Symptoms of Flu",
          "url": "https://www.cdc.gov/flu/signs-symptoms/index.html"
        },
        {
          "name": "MedlinePlus: Fever",
          "url": "https://medlineplus.gov/fever.html"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
        },
        {
          "name": "PMC: Wearable devices and illness detection research",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11339560/"
        },
        {
          "name": "PMC: Wearables, physiologic signals, and infectious illness monitoring",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9384446/"
        },
        {
          "name": "Validation of Six Wearable Devices for Sleep, Heart Rate, and HRV",
          "url": "https://pubmed.ncbi.nlm.nih.gov/36016077/"
        }
      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html#short-answer"
        },
        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-illness-risk-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 494,
      "title": "Consumer heat strain score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, heat stress, heart rate, skin temperature, hydration, work-rest decisions, and validation limits.",
      "sourceTag": "CDC + PMC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC/NIOSH: Heat-Related Illnesses",
          "url": "https://www.cdc.gov/niosh/heat-stress/about/illnesses.html"
        },
        {
          "name": "CDC/NIOSH: Heat Stress in Construction",
          "url": "https://www.cdc.gov/niosh/bulletin/2020/heat-stress-construction.html"
        },
        {
          "name": "CDC/NIOSH: NIOSH Fast Facts: Protecting Yourself from Heat Stress",
          "url": "https://www.cdc.gov/niosh/docs/2010-114/default.html"
        },
        {
          "name": "CDC/NIOSH: Heat Stress in PPE",
          "url": "https://www.cdc.gov/niosh/bulletin/2020/heat-stress-ppe.html"
        },
        {
          "name": "PMC: Wearables in Heat-Exposed Workers",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12372262/"
        },
        {
          "name": "PubMed: Validation of Perceptual Strain Index to Evaluate the Thermal Strain in Experimental Hot Conditions",
          "url": "https://pubmed.ncbi.nlm.nih.gov/26425333/"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
        }
      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html#short-answer"
        },
        {
          "name": "How to evaluate a claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html#how-to-evaluate-a-claim"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-heat-strain-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 495,
      "title": "Consumer recovery reserve score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, HRV, sleep, training load, readiness, fatigue, and validation limits.",
      "sourceTag": "FDA + PMC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "Systematic Review: Wearable Devices and HRV Accuracy",
          "url": "https://pubmed.ncbi.nlm.nih.gov/29668452/"
        },
        {
          "name": "Scoping Review: Wearable Devices to Monitor Recovery",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8988014/"
        },
        {
          "name": "Validation of Sleep Measurement in a Consumer Wearable Device",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC7849656/"
        },
        {
          "name": "Validation of Six Wearable Devices for Sleep, Heart Rate, and HRV",
          "url": "https://pubmed.ncbi.nlm.nih.gov/36016077/"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "AASM: Consumer Sleep Technology Position Statement",
          "url": "https://pubmed.ncbi.nlm.nih.gov/27306319/"
        },
        {
          "name": "MedlinePlus: How to Understand Your Lab Results",
          "url": "https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/"
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      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html#short-answer"
        },
        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-recovery-reserve-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 496,
      "title": "Consumer dehydration risk score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, sweat, urine, electrolytes, heat exposure, symptoms, and validation limits.",
      "sourceTag": "MedlinePlus + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "MedlinePlus: Dehydration",
          "url": "https://medlineplus.gov/dehydration.html"
        },
        {
          "name": "MedlinePlus: Electrolyte Panel",
          "url": "https://medlineplus.gov/lab-tests/electrolyte-panel/"
        },
        {
          "name": "MedlinePlus: Urine Specific Gravity Test",
          "url": "https://medlineplus.gov/ency/article/003587.htm"
        },
        {
          "name": "MedlinePlus: Water in Diet",
          "url": "https://medlineplus.gov/ency/article/002471.htm"
        },
        {
          "name": "MedlinePlus: Fluid and Electrolyte Balance",
          "url": "https://medlineplus.gov/fluidandelectrolytebalance.html"
        },
        {
          "name": "CDC: Heat and Athletes",
          "url": "https://www.cdc.gov/heat-health/risk-factors/heat-and-athletes.html"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        }
      ],
      "sectionCount": 9,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#short-answer"
        },
        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "Where it can mislead",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#where-it-can-mislead"
        },
        {
          "name": "Who should be careful",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#who-should-be-careful"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#questions-to-ask"
        },
        {
          "name": "When clinical care matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#when-clinical-care-matters-more"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-dehydration-risk-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 497,
      "title": "Consumer altitude readiness score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, SpO2, HRV, ascent rate, acclimatization, altitude illness, and validation limits.",
      "sourceTag": "CDC + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
        },
        {
          "name": "CDC Travelers' Health: Travel to High Altitudes",
          "url": "https://wwwnc.cdc.gov/travel/page/travel-to-high-altitudes"
        },
        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "PMC: The Use of Pulse Oximetry in the Assessment of Acclimatization to High Altitude",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC7916608/"
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        {
          "name": "PMC: Pathophysiology and Therapy of High-Altitude Sickness",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9325098/"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html#short-answer"
        },
        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "What matters more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html#what-matters-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-altitude-readiness-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 498,
      "title": "Consumer sweat electrolyte score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, sweat sodium, hydration planning, sports use, overhydration, validation, and limits.",
      "sourceTag": "MedlinePlus + CDC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "MedlinePlus: Electrolyte Panel",
          "url": "https://medlineplus.gov/lab-tests/electrolyte-panel/"
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        {
          "name": "MedlinePlus: Electrolytes",
          "url": "https://medlineplus.gov/ency/article/002350.htm"
        },
        {
          "name": "MedlinePlus: Sodium Blood Test",
          "url": "https://medlineplus.gov/lab-tests/sodium-blood-test"
        },
        {
          "name": "MedlinePlus: Dehydration",
          "url": "https://medlineplus.gov/dehydration.html"
        },
        {
          "name": "CDC: Heat and Athletes",
          "url": "https://www.cdc.gov/heat-health/risk-factors/heat-and-athletes.html"
        },
        {
          "name": "CDC: Heat-related Illnesses",
          "url": "https://www.cdc.gov/niosh/heat-stress/about/illnesses.html"
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        {
          "name": "CDC: Heat and Cold Illness in Travelers",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/heat-and-cold-illness-in-travelers.html"
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      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html#short-answer"
        },
        {
          "name": "When the claim is useful",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html#when-the-claim-is-useful"
        },
        {
          "name": "Where it can mislead",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html#where-it-can-mislead"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "What to ask before you trust it",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html#what-to-ask-before-you-trust-it"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-sweat-electrolyte-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 499,
      "title": "Consumer respiratory load score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, respiratory rate, oxygen saturation, illness detection, training load, altitude, and validation limits.",
      "sourceTag": "FDA + CDC",
      "sourceCount": 7,
      "sources": [
        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
        },
        {
          "name": "PMC: Wearable Sensors and Respiratory Monitoring",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC6833321/"
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        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "MedlinePlus: Anemia",
          "url": "https://medlineplus.gov/anemia.html"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html#short-answer"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-load-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 500,
      "title": "Consumer oxygen debt score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, exercise recovery, VO2, CPET, lactate, oxygen deficit language, validation, and limits.",
      "sourceTag": "NCBI + FDA + MedlinePlus",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Exercise Physiology",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK482280/"
        },
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "MedlinePlus: Lactate Test",
          "url": "https://medlineplus.gov/lab-tests/lactate-test/"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
        },
        {
          "name": "Systematic Review: Accuracy of Wearables for VO2max and Lactate Threshold",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12748164/"
        },
        {
          "name": "Validity of smartwatch-derived estimates of lactate threshold heart rate and pace compared to graded exercise testing",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12309276/"
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      ],
      "sectionCount": 8,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#short-answer"
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        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-debt-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 501,
      "title": "Consumer ventilation efficiency score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, VE/VCO2, CPET, breathing patterns, oxygen saturation, exercise testing, and validation limits.",
      "sourceTag": "PMC + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
        },
        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
        },
        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html#short-answer"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilation-efficiency-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 502,
      "title": "Consumer breathing reserve score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, CPET ventilatory reserve, respiratory rate, oxygen saturation, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
        },
        {
          "name": "NHLBI: Pulmonary Function Tests",
          "url": "https://www.nhlbi.nih.gov/science/pulmonary-function-lab/tests"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
        },
        {
          "name": "FDA: Pulse Oximeter Basics",
          "url": "https://www.fda.gov/consumers/consumer-updates/pulse-oximeter-basics"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      "sectionCount": 9,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#short-answer"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#when-symptoms-matter"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#questions-to-ask"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-reserve-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 503,
      "title": "Consumer CO2 tolerance score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Breath holds, capnography, end-tidal CO2, CPET, breathing apps, anxiety and training claims, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Capnography and Respiratory Monitoring",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK539754/"
        },
        {
          "name": "NCBI Bookshelf: Respiratory Failure in Adults",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK526127/"
        },
        {
          "name": "MedlinePlus: Carbon Dioxide in Blood",
          "url": "https://medlineplus.gov/lab-tests/carbon-dioxide-co2-in-blood/"
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        {
          "name": "NCBI Bookshelf: Serum Total Carbon Dioxide",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK308/"
        },
        {
          "name": "PMC: Practical Guide to CPET in Adults",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8754079/"
        },
        {
          "name": "FDA: Qualifying a Biomarker through the Biomarker Qualification Program",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/qualifying-biomarker-through-biomarker-qualification-program"
        },
        {
          "name": "FDA: Direct-to-Consumer Tests",
          "url": "https://www.fda.gov/medical-devices/in-vitro-diagnostics/direct-consumer-tests"
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      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#short-answer"
        },
        {
          "name": "What real CO2 measurement looks like",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#what-real-co2-measurement-looks-like"
        },
        {
          "name": "What consumer scores usually use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#what-consumer-scores-usually-use"
        },
        {
          "name": "When to be cautious",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#when-to-be-cautious"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#questions-to-ask"
        },
        {
          "name": "When clinical testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#when-clinical-testing-matters-more"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-co2-tolerance-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 504,
      "title": "Consumer respiratory recovery score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, respiratory rate, oxygen saturation, training recovery, CPET context, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA + MedlinePlus",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
        },
        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
        },
        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html#short-answer"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 505,
      "title": "Consumer breathing age score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, lung age language, respiratory rate, CPET, spirometry context, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
        },
        {
          "name": "NHLBI: Pulmonary Function Tests",
          "url": "https://www.nhlbi.nih.gov/science/pulmonary-function-lab/tests"
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        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "FDA: Pulse Oximeter Basics",
          "url": "https://www.fda.gov/consumers/consumer-updates/pulse-oximeter-basics"
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        {
          "name": "MedlinePlus: Pulmonary Function Tests",
          "url": "https://medlineplus.gov/ency/article/003853.htm"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#short-answer"
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        {
          "name": "What the score may use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#what-the-score-may-use"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#questions-to-ask"
        },
        {
          "name": "When clinical testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#when-clinical-testing-matters-more"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-age-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 506,
      "title": "Consumer oxygen recovery score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, VO2 recovery, CPET, oxygen saturation, training recovery, symptoms, and validation limits.",
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          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
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        {
          "name": "NCBI Bookshelf: Oxygen Saturation",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK525974/"
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        {
          "name": "NCBI Bookshelf: Exercise Capacity",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK404/"
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        {
          "name": "PMC: Dynamic assessment of ventilatory efficiency during recovery from peak exercise",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC7240171/"
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        {
          "name": "FDA: Pulse Oximeters for Medical Purposes",
          "url": "https://www.fda.gov/media/184896/download"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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        {
          "name": "What real recovery measurement looks like",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html#what-real-recovery-measurement-looks-like"
        },
        {
          "name": "What consumer scores usually use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html#what-consumer-scores-usually-use"
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        {
          "name": "When to be cautious",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html#when-to-be-cautious"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 507,
      "title": "Consumer respiratory strain score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-strain-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, breathing load, CPET, oxygen saturation, exercise signals, symptoms, and validation limits.",
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      "sourceCount": 7,
      "sources": [
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          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
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        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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          "name": "Short answer",
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        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-strain-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-strain-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-strain-score-claims.html#when-symptoms-matter-more-than-the-score"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-strain-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-strain-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-strain-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 508,
      "title": "Consumer breathing efficiency score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, CPET, ventilation, respiratory rate, oxygen saturation, training, and validation limits.",
      "sourceTag": "PMC + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "PMC: Cardiopulmonary Exercise Test: Background, Applicability and Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
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        {
          "name": "PMC: Practical guide to cardiopulmonary exercise testing in adults",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8754079/"
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        {
          "name": "PMC: Cardiopulmonary exercise testing in the assessment of exertional dyspnea",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC4375746/"
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        {
          "name": "PMC: Assessing Exercise Limitation Using Cardiopulmonary Exercise Testing",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC3506917/"
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        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
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        {
          "name": "FDA: Qualifying a Biomarker through the Biomarker Qualification Program",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/qualifying-biomarker-through-biomarker-qualification-program"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#short-answer"
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        {
          "name": "What CPET measures",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#what-cpet-measures"
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        {
          "name": "What consumer scores usually use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#what-consumer-scores-usually-use"
        },
        {
          "name": "When to be cautious",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#when-to-be-cautious"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#questions-to-ask"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-efficiency-score-claims.html#related-guides-heading"
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      ]
    },
    {
      "position": 509,
      "title": "Consumer oxygen reserve score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, oxygen saturation, VO2, CPET, altitude, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
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        {
          "name": "MedlinePlus: Pulse Oximetry",
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        {
          "name": "MedlinePlus: Anemia",
          "url": "https://medlineplus.gov/anemia.html"
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        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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        {
          "name": "FDA: About Biomarkers and Qualification",
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#short-answer"
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        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-reserve-score-claims.html#related-guides-heading"
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      ]
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    {
      "position": 510,
      "title": "Consumer ventilatory reserve score claims",
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
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      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
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        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
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        {
          "name": "NCBI Bookshelf: Oxygen Saturation",
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
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        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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          "name": "MedlinePlus: Exercise Stress Test",
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        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilatory-reserve-score-claims.html#how-to-judge-the-claim"
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        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilatory-reserve-score-claims.html#why-the-claim-is-limited"
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        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilatory-reserve-score-claims.html#when-symptoms-matter-more-than-the-score"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilatory-reserve-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilatory-reserve-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-ventilatory-reserve-score-claims.html#related-guides-heading"
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      "position": 511,
      "title": "Consumer respiratory resilience score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, illness recovery, respiratory rate, oxygen saturation, CPET context, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
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        {
          "name": "NHLBI: Pulmonary Function Tests",
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
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        {
          "name": "FDA: Pulse Oximeter Basics",
          "url": "https://www.fda.gov/consumers/consumer-updates/pulse-oximeter-basics"
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        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
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        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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          "name": "Short answer",
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        {
          "name": "What may feed the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#what-may-feed-the-score"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#what-the-score-cannot-tell-you"
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        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#when-symptoms-matter"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-resilience-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 512,
      "title": "Consumer respiratory capacity score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-capacity-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, CPET, lung function language, VO2, respiratory rate, oxygen saturation, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
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        {
          "name": "MedlinePlus: Anemia",
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        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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        {
          "name": "FDA: About Biomarkers and Qualification",
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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      "sectionCount": 7,
      "sections": [
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          "name": "Short answer",
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        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-capacity-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-capacity-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-capacity-score-claims.html#when-symptoms-matter-more-than-the-score"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-capacity-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-capacity-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-capacity-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 513,
      "title": "Consumer oxygen capacity score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, VO2 max, CPET, oxygen saturation, altitude, anemia, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
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          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "NCBI Bookshelf: Oxygen Saturation",
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "MedlinePlus: Anemia",
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        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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          "name": "Short answer",
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        },
        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-capacity-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 514,
      "title": "Consumer oxygen utilization score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, VO2, CPET, SpO2, recovery, altitude, training, and validation limits.",
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      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "MedlinePlus: Anemia",
          "url": "https://medlineplus.gov/anemia.html"
        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      ],
      "sectionCount": 8,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#short-answer"
        },
        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-utilization-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 515,
      "title": "Consumer breathing capacity score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html",
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      "topicName": "Emerging biometrics",
      "description": "Spirometry, CPET, respiratory rate, oxygen saturation, wearables, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
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        {
          "name": "NHLBI: Pulmonary Function Tests",
          "url": "https://www.nhlbi.nih.gov/science/pulmonary-function-lab/tests"
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        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "FDA: Pulse Oximeter Basics",
          "url": "https://www.fda.gov/consumers/consumer-updates/pulse-oximeter-basics"
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        {
          "name": "MedlinePlus: Pulmonary Function Tests",
          "url": "https://medlineplus.gov/ency/article/003853.htm"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      "sectionCount": 9,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#short-answer"
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        {
          "name": "What the score may use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#what-the-score-may-use"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#when-symptoms-matter"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#questions-to-ask"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-capacity-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 516,
      "title": "Consumer respiratory efficiency score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "CPET, breathing rate, SpO2, VO2, wearables, ventilation, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "PMC: Cardiopulmonary Exercise Test: Background, Applicability and Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
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        {
          "name": "PMC: Practical guide to cardiopulmonary exercise testing in adults",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8754079/"
        },
        {
          "name": "PMC: Cardiopulmonary exercise testing in the assessment of exertional dyspnea",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC4375746/"
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        {
          "name": "PMC: Assessing Exercise Limitation Using Cardiopulmonary Exercise Testing",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC3506917/"
        },
        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
        },
        {
          "name": "FDA: Qualifying a Biomarker through the Biomarker Qualification Program",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/qualifying-biomarker-through-biomarker-qualification-program"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      ],
      "sectionCount": 7,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html#short-answer"
        },
        {
          "name": "What CPET measures",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html#what-cpet-measures"
        },
        {
          "name": "What consumer scores usually use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html#what-consumer-scores-usually-use"
        },
        {
          "name": "When to be cautious",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html#when-to-be-cautious"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-efficiency-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 517,
      "title": "Consumer oxygen efficiency score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, VO2, CPET, pulse oximetry, recovery, and validation limits.",
      "sourceTag": "NCBI + MedlinePlus + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
        },
        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "Systematic Review: Accuracy of Wearables for VO2max and Lactate Threshold",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12748164/"
        },
        {
          "name": "Validity of smartwatch-derived estimates of lactate threshold heart rate and pace compared to graded exercise testing",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12309276/"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
        }
      ],
      "sectionCount": 9,
      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#short-answer"
        },
        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "What validation would look like",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#what-validation-would-look-like"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-efficiency-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 518,
      "title": "Consumer respiratory reserve score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "CPET, breathing reserve, SpO2, respiratory rate, wearables, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
        },
        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
        },
        {
          "name": "NHLBI: Pulmonary Function Tests",
          "url": "https://www.nhlbi.nih.gov/science/pulmonary-function-lab/tests"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
        },
        {
          "name": "FDA: Pulse Oximeter Basics",
          "url": "https://www.fda.gov/consumers/consumer-updates/pulse-oximeter-basics"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
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      ],
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      "sections": [
        {
          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html#short-answer"
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        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html#what-the-score-cannot-tell-you"
        },
        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html#when-symptoms-matter"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-reserve-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 519,
      "title": "Consumer oxygen load score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, VO2, SpO2, exercise load, altitude, recovery, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA + MedlinePlus",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
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        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
        },
        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
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        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
        },
        {
          "name": "MedlinePlus: Exercise Stress Test",
          "url": "https://medlineplus.gov/lab-tests/exercise-stress-test/"
        },
        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#short-answer"
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        {
          "name": "What the score may mix",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#what-the-score-may-mix"
        },
        {
          "name": "What a valid claim should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#what-a-valid-claim-should-disclose"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-load-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 520,
      "title": "Consumer respiratory recovery load score claims",
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, breathing, SpO2, CPET concepts, recovery trends, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
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          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
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        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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      "sections": [
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-load-score-claims.html#short-answer"
        },
        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-load-score-claims.html#how-to-judge-the-claim"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-load-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-load-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-load-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-load-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-load-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 521,
      "title": "Consumer oxygen strain score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, SpO2, VO2 estimates, CPET concepts, altitude, symptoms, and safety limits.",
      "sourceTag": "NCBI + FDA",
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      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
        },
        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
        },
        {
          "name": "MedlinePlus: Anemia",
          "url": "https://medlineplus.gov/anemia.html"
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        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
        },
        {
          "name": "FDA: About Biomarkers and Qualification",
          "url": "https://www.fda.gov/drugs/biomarker-qualification-program/about-biomarkers-and-qualification"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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          "name": "Short answer",
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        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html#what-companies-should-disclose"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-strain-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
      "position": 522,
      "title": "Consumer breathing strain score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html",
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      "topicName": "Emerging biometrics",
      "description": "Wearables, respiratory rate, SpO2, CPET concepts, symptoms, and validation limits.",
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      "sourceCount": 7,
      "sources": [
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          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK557886/"
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
          "url": "https://www.ncbi.nlm.nih.gov/books/NBK470348/"
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        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
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        {
          "name": "MedlinePlus: Lung Function Tests",
          "url": "https://medlineplus.gov/lab-tests/lung-function-tests/"
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        {
          "name": "NHLBI: Pulmonary Function Tests",
          "url": "https://www.nhlbi.nih.gov/science/pulmonary-function-lab/tests"
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        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
          "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5137392/"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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      "sections": [
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          "name": "Short answer",
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        {
          "name": "What the score usually combines",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#what-the-score-usually-combines"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#why-the-claim-is-limited"
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        {
          "name": "What the score cannot tell you",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#what-the-score-cannot-tell-you"
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        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#questions-to-ask"
        },
        {
          "name": "When symptoms matter more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#when-symptoms-matter-more"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-strain-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 523,
      "title": "Consumer oxygen recovery load score claims",
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      "topicName": "Emerging biometrics",
      "description": "SpO2, VO2 estimates, wearables, CPET concepts, altitude, symptoms, and limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
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          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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          "name": "NCBI Bookshelf: Pulse Oximetry",
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        {
          "name": "MedlinePlus: Pulse Oximetry",
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        {
          "name": "MedlinePlus: Anemia",
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        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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          "name": "Short answer",
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        {
          "name": "What the score may mix",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#what-the-score-may-mix"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#why-the-claim-is-limited"
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        {
          "name": "What a valid claim should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#what-a-valid-claim-should-disclose"
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        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#when-follow-up-matters-more"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-recovery-load-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 524,
      "title": "Consumer respiratory recovery burden score claims",
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      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Wearables, breathing rate, SpO2, CPET concepts, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
        {
          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "PMC: Cardiopulmonary Exercise Test Interpretation",
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
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        {
          "name": "MedlinePlus: Pulse Oximetry",
          "url": "https://medlineplus.gov/lab-tests/pulse-oximetry/"
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        {
          "name": "FDA: Pulse Oximeters",
          "url": "https://www.fda.gov/medical-devices/products-and-medical-procedures/pulse-oximeters"
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        {
          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
          "url": "https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html"
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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          "name": "Short answer",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-burden-score-claims.html#short-answer"
        },
        {
          "name": "How to judge the claim",
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        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-burden-score-claims.html#why-the-claim-is-limited"
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        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-burden-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-burden-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-burden-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-respiratory-recovery-burden-score-claims.html#related-guides-heading"
        }
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      "position": 525,
      "title": "Consumer oxygen readiness score claims",
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      "sourceTag": "NCBI + FDA",
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          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
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        {
          "name": "FDA: Pulse Oximeters",
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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        {
          "name": "What the score may mix",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#what-the-score-may-mix"
        },
        {
          "name": "Why the claim is limited",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#why-the-claim-is-limited"
        },
        {
          "name": "What a valid claim should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#what-a-valid-claim-should-disclose"
        },
        {
          "name": "When symptoms matter more than the score",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#when-symptoms-matter-more-than-the-score"
        },
        {
          "name": "When follow-up matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#when-follow-up-matters-more"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#questions-to-ask"
        },
        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-readiness-score-claims.html#related-guides-heading"
        }
      ]
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    {
      "position": 526,
      "title": "Consumer breathing readiness score claims",
      "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-readiness-score-claims.html",
      "topic": "biomarkers",
      "topicName": "Emerging biometrics",
      "description": "Respiratory rate, SpO2, CPET concepts, wearables, symptoms, and validation limits.",
      "sourceTag": "NCBI + FDA",
      "sourceCount": 7,
      "sources": [
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          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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        {
          "name": "MedlinePlus: Lung Function Tests",
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        {
          "name": "NHLBI: Pulmonary Function Tests",
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          "name": "FDA: About Biomarkers and Qualification",
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        {
          "name": "FDA: Pulse Oximeter Basics",
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
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        {
          "name": "MedlinePlus: Exercise Stress Test",
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        {
          "name": "What the score may use",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-readiness-score-claims.html#what-the-score-may-use"
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        {
          "name": "What the score cannot tell you",
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        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-readiness-score-claims.html#when-symptoms-matter"
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        {
          "name": "Questions to ask",
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        },
        {
          "name": "When clinical testing matters more",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-readiness-score-claims.html#when-clinical-testing-matters-more"
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          "name": "What companies should disclose",
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-readiness-score-claims.html#faq"
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        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-breathing-readiness-score-claims.html#related-guides-heading"
        }
      ]
    },
    {
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      "title": "Consumer oxygen adaptation score claims",
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      "topic": "biomarkers",
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      "description": "Altitude, SpO2, VO2 estimates, wearables, training adaptation, and limits.",
      "sourceTag": "NCBI + FDA",
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      "sources": [
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          "name": "NCBI Bookshelf: Cardiopulmonary Exercise Testing",
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          "name": "MedlinePlus: Pulse Oximetry",
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        {
          "name": "NCBI Bookshelf: Pulse Oximetry",
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          "name": "CDC Yellow Book: High-Altitude Travel and Altitude Illness",
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          "name": "FDA: Pulse Oximeter Basics",
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          "name": "FDA: About Biomarkers and Qualification",
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          "name": "MedlinePlus: Exercise Stress Test",
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        {
          "name": "How to judge the claim",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-adaptation-score-claims.html#how-to-judge-the-claim"
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        {
          "name": "What the score cannot tell you",
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        {
          "name": "When symptoms matter",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-adaptation-score-claims.html#when-symptoms-matter"
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        {
          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-adaptation-score-claims.html#questions-to-ask"
        },
        {
          "name": "What companies should disclose",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-adaptation-score-claims.html#what-companies-should-disclose"
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        {
          "name": "FAQ",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-adaptation-score-claims.html#faq"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/consumer-oxygen-adaptation-score-claims.html#related-guides-heading"
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      "position": 528,
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          "name": "NCCIH: 5 Things To Know About Omega-3s for Heart Disease",
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          "name": "American Heart Association: Omega-3 Fatty Acids for Hypertriglyceridemia",
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          "name": "CDC: LDL and HDL Cholesterol and Triglycerides",
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          "name": "PubMed: The Omega-3 Index as a Proposed Coronary Heart Disease Risk Factor",
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          "name": "MedlinePlus: Laboratory Tests",
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          "name": "What the test looks at",
          "url": "https://mainstreetbloodlab.com/articles/omega-3-index-test.html#what-the-test-looks-at"
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        {
          "name": "What official sources say about omega-3s",
          "url": "https://mainstreetbloodlab.com/articles/omega-3-index-test.html#what-official-sources-say-about-omega-3s"
        },
        {
          "name": "Cardiovascular evidence, without the sales pitch",
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        {
          "name": "Why people order it",
          "url": "https://mainstreetbloodlab.com/articles/omega-3-index-test.html#why-people-order-it"
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        {
          "name": "What can affect results",
          "url": "https://mainstreetbloodlab.com/articles/omega-3-index-test.html#what-can-affect-results"
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          "name": "Safety questions before acting",
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          "name": "Questions to ask",
          "url": "https://mainstreetbloodlab.com/articles/omega-3-index-test.html#questions-to-ask"
        },
        {
          "name": "Related guides",
          "url": "https://mainstreetbloodlab.com/articles/omega-3-index-test.html#related-guides-heading"
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}