Short answer
Trichomoniasis, often called trich, is a common STI caused by Trichomonas vaginalis. It is not automatically included in every STI panel. CDC says no general screening recommendation is available for everyone, but diagnostic testing should be performed for women seeking care for vaginal discharge. Screening may be considered in high-prevalence settings and for asymptomatic women at high risk, and routine annual screening is recommended for asymptomatic women with HIV.
Why panels vary
| Reason | What it means for you | What to ask |
|---|---|---|
| “Full panel” is not standardized. | A panel may include HIV, syphilis, chlamydia, and gonorrhea but leave out trichomoniasis. | Is T. vaginalis or trichomoniasis listed by name? |
| Screening guidance is not universal. | Trich testing is often ordered for symptoms, pregnancy/HIV context, local risk, or clinician judgment. | Do my symptoms, partners, or risk factors make trich testing appropriate? |
| Test methods differ. | A wet mount, rapid test, NAAT, culture, urine test, or swab may not mean the same thing. | Which test method is being used, and what sample is accepted? |
| Men’s testing can be more limited. | Some tests are FDA-cleared for women only; some settings use validated male urine testing. | Is the test validated for my anatomy and sample type? |
| Symptoms overlap with other conditions. | Vaginal discharge, odor, irritation, or urinary symptoms can have multiple causes. | Should I also be evaluated for BV, yeast, chlamydia, gonorrhea, or other STIs? |
Common trichomoniasis test types
| Test type | Typical sample | Important caveat |
|---|---|---|
| NAAT | Vaginal swab, endocervical swab, urine, liquid Pap specimen, or male urine depending on the assay. | CDC says NAATs are highly sensitive and detect more infections than wet mount among women. |
| Wet mount microscopy | Vaginal fluid. | Inexpensive and fast, but CDC says sensitivity is low and falls quickly after collection. |
| Rapid antigen or molecular tests | Usually vaginal specimens, with details depending on the product. | Some rapid tests are not cleared or not sensitive for men. |
| Culture | Vaginal secretions for women; urethral swab, urine sediment, or semen for men. | Can be useful in some recurrent or resistance contexts but is slower and less commonly used than molecular testing. |
| Pap smear finding | Cervical cytology specimen. | CDC says Pap smears are not diagnostic tests for trichomoniasis; confirm with a sensitive diagnostic test. |
When to ask about trich testing
- You have vaginal discharge, odor, itching, irritation, pain with sex, or urinary discomfort.
- A partner tested positive for trichomoniasis or has symptoms.
- You were told you had a “full STI panel” but trichomoniasis was not listed.
- You are receiving care in a high-prevalence setting such as an STI clinic or correctional facility.
- You are an asymptomatic woman with HIV, where CDC recommends routine annual screening.
- You are pregnant and have symptoms; CDC says symptomatic pregnant women should be tested and treated.
After a positive result
CDC says people with T. vaginalis should abstain from sex until they and their sex partners have been treated and symptoms have resolved. CDC also says testing for other STIs, including HIV, syphilis, gonorrhea, and chlamydia, should be performed for people with trichomoniasis. For a broader checklist, see the positive STI result next steps guide.
Retesting and repeat positives
Because reinfection is common among women treated for trichomoniasis, CDC recommends retesting all sexually active women about 3 months after initial treatment. Data are insufficient to support routine retesting of men after treatment. For persistent or recurrent infection, timing and test method matter because NAAT testing too soon after treatment can detect residual nucleic acid. For the broader follow-up distinction, see the STI retesting after treatment guide.
Questions to ask before testing
- Does this STI panel include trichomoniasis by name?
- Is the test a NAAT, wet mount, rapid test, culture, or something else?
- Which sample will be used: vaginal swab, urine, Pap specimen, urethral swab, semen, or another sample?
- Is the test cleared or validated for my anatomy and sample type?
- If positive, will my partner need testing, presumptive treatment, or both?
- Should I also test for HIV, syphilis, chlamydia, gonorrhea, hepatitis B, or hepatitis C?
Related Lab Intel guides
For panel coverage, see the full STI panel guide. For symptom-related or follow-up care, see the positive STI result next steps guide. For BV and yeast overlap, see the BV and yeast testing versus STI testing guide. For access questions, see the free and low-cost STI testing guide. For at-home kit tradeoffs, see the at-home STI tests versus clinic testing guide.