Gynaecology & Obstetrics 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. 💡 Explanation Regarding diagnostic tests for syphilis, true is all except ✓ Correct Answer: C. TP-PA test is appropriate for population screening for syphilis.