Short answer
Familial hypercholesterolemia, or FH, can be evaluated with LDL cholesterol levels, personal and family history, physical findings, and sometimes genetic testing. A pathogenic variant can confirm inherited FH and help relatives get targeted testing, but a negative genetic test does not always rule out inherited high LDL risk.
Two ways the question is framed
| Approach | What it uses | Limit |
|---|---|---|
| Clinical criteria | LDL level, premature heart disease, family history, and physical findings. | Family history can be incomplete; LDL can be modified by treatment. |
| Genetic testing | Looks for variants in genes linked with FH. | Not every inherited high-LDL pattern has an identifiable variant. |
| Cascade screening | Tests relatives with cholesterol and/or a known family variant. | Relatives need counseling and follow-up, not only a lab result. |
| DTC DNA result | May report selected variants or raw-data findings. | Medical decisions need clinical confirmation. |
Why clinical criteria still matter
Clinical FH diagnosis still matters because LDL history and family history show the real risk pattern over time. A negative DNA result does not erase untreated LDL levels, a strong family pattern, or the need for treatment and screening in relatives. MedlinePlus and CDC both point to cholesterol level, family history, and genetic counseling as parts of the decision, not a one-test answer.
When family history changes the next step
Follow-up matters more when the LDL pattern is severe, when family history is stronger than the DNA result, or when a negative test should not override the clinical picture. Genetics counseling helps decide whether the next step is cascade screening, lipid specialist review, or a clinical FH diagnosis.
Questions to ask
- What were my highest untreated LDL cholesterol levels?
- Has anyone in the family had early heart attack, stroke, stents, bypass surgery, or very high cholesterol?
- If genetic testing is negative, does my LDL pattern still need FH-level treatment?
- Which relatives should have lipid screening, and when should children be checked?
When follow-up matters more
Follow-up becomes more important when untreated LDL is very high, when there is a family history of early heart disease, when a child or sibling may need screening, or when the report suggests a variant of uncertain significance. In those settings, the result should sharpen family risk assessment rather than stand in for the whole clinical picture.
Related guides: familial hypercholesterolemia genetic testing, lipid panel, ApoB and Lp(a) blood tests, and hereditary heart disease genetic testing.
How Genetic Testing Is Done
Genetic testing is usually done with blood or saliva, and the lab workflow depends on whether the question is a targeted variant, a panel, or confirmation after a clinical finding. Genetics counseling can help clarify whether the next step is a new test, family testing, or a different clinical workup.
FAQ
Can FH be diagnosed without genetic testing?
Yes. FH can be diagnosed clinically from untreated LDL levels, family history, and physical findings even if DNA testing is unavailable or negative.
Why do LDL levels still matter if genetic testing is done?
LDL levels show the actual cholesterol burden that drives treatment intensity and family follow-up, so the cholesterol pattern still carries real weight.
What does a negative FH genetic test mean?
It means no disease-causing variant was found on that test, but it does not always rule out inherited high LDL risk or a clinical FH pattern.
What is cascade screening?
Cascade screening means checking relatives of a person with FH by cholesterol testing, genetic testing, or both so more family members can be found early.
Which relatives are usually checked first?
First-degree relatives such as parents, siblings, and children are usually the first group considered for cholesterol screening or targeted family testing.
Who should interpret the result?
A clinician, lipid specialist, or genetic counselor can help combine the LDL pattern, family history, and genetic result into one risk picture.