Regarding diagnostic tests for syphilis, true is all except: (A) VDRL test is used for measurement of antibody titers to assess response to treatment., (B) FTA-ABS is used to confirm diagnosis in clinically suspected syphilis., (C) TP-PA test is appropriate for population screening for syphilis., (D) Fourfold decrease in titer is required by 6 months after therapy for primary syphilis.
Answer is C. For population screening for syphilis, VDRL or RPR test is appropriate.