Difficulty: Medium
Average Score: 80%
Full-length
A client visiting a family planning clinic is suspected of having an STD. The most diagnostic test for all stages of treponema pallidum (syphilis) is the:
Correct answer
C
Rationale
The FTA-Abs test is the most specific and diagnostic for all stages of syphilis. VDRL and RPR are non-treponemal tests that can have false positives, so A and B are incorrect. Thayer-Martin culture is used for gonorrhea, so D is incorrect.