fluorescent treponemal antibody absorption test

…enzyme immunoassay (EIA); and the fluorescent treponemal antibody absorption (FTA-ABS) test. Treponemal tests are based on the detection of treponemal antibody—the antibody that attacks T. pallidum, the spirochete that causes syphilis—in the blood. In most cases, the diagnosis of syphilis is performed using both a nontreponemal and a treponemal test.