To diagnose trichomoniasis, a doctor must perform a physical exam and lab test. Lab tests are performed on a sample of vaginal fluid or urethral fluid to look for the disease-causing parasite. The parasite is harder to detect in men than in women.
Most NAATs can be used with both vaginal and urine samples for women to find the parasite.
SOme of the tests doctors perform include: cell cultures, antigen tests (antibodies bind if the Trichomonas parasite is present, which causes a color change that indicates infection), tests that look for Trichomonas DNA, and examining samples of vaginal fluid (for women) or urethral discharge (for men) under a microscope