Trichomoniasis Test
Explanation
A trichomoniasis test looks for Trichomonas vaginalis, a parasite that causes a sexually transmitted infection. The test may use a genital swab or urine, depending on the laboratory method.
How is the parasite detected?
One method examines a fresh sample under a microscope. A molecular test looks for the parasite's genetic material. Other methods detect proteins from the parasite or grow it in a laboratory.
The suitable sample depends on the test. A swab and a urine sample are not interchangeable for every method. This test looks for trichomoniasis; it does not rule out other sexually transmitted infections.
Can a negative test miss an infection?
Yes. Examination under a microscope can miss infections that a molecular test detects. If symptoms or other findings still suggest trichomoniasis, another test may be needed after a negative microscope result.
What matters when interpreting a positive result?
A positive result means the test detected the parasite or material from it. Your care team considers the method, symptoms and any recent treatment.
Soon after treatment, a molecular test can still detect leftover genetic material. This does not necessarily mean that the infection is still present. The timing and choice of a repeat test therefore matter.
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