Which statement about Trichomonas testing is correct?

• A. The initial test is vaginal culture.
• B. The gold standard test is KOH prep.
• C. The initial test is KOH prep.
• D. The gold standard test is clinical diagnosis.

Answer: (C)

Testing for Trichomonas vaginalis centers on detecting the organism or its genetic material. A quick bedside option is a saline vaginal wet mount to look for motile trichomonads, but its sensitivity is limited, so a negative result doesn’t reliably rule out infection. For most reliable results, nucleic acid amplification testing (NAAT) is preferred because of its high sensitivity and specificity. Culturing the organism used to be the reference standard, but today NAAT is generally more accurate and faster. KOH preparation is not used to diagnose Trichomonas; it’s typically employed to evaluate for fungal infections or bacterial vaginosis, not Trichomonas.