The fluorescent treponemal antibody absorption (FTA-ABS) test was performed in 77 consecutive patients with dark-field-positive primary syphilis. The test was reactive in 70 of the 77 patients (91%). These results make this serologic test extremely valuable in the diagnosis of syphilis at a time when this disease is on the increase, and the number of well-trained darkfield technicians is on the wane.
(JAMA 228:859-860, 1974)
Duncan WC, Knox JM, Wende RD. The FTA-ABS Test in Dark-Field-Positive Primary Syphilis. JAMA. 1974;228(7):859-860. doi:10.1001/jama.1974.03230320029022