Fluorescent Treponemal Antibody-Absorption Test

**Definition:** Serologic assay that detects antibodies to Treponema pallidum, the etiologic agent of syphilis. After diluting the patient's serum to remove non-specific antibodies, the serum is mixed on a glass slide with Nichol's strain of Treponema pallidum. An antigen-antibody reaction occurs if the test is positive and the bound antibodies are detected with fluoresceinated antihuman gamma-globulin antibody.

**Tree numbers:** - E01.370.225.812.735.850.200 - E05.200.812.735.850.200 - E05.478.594.760.850.200

**Synonyms:** - FTA-ABS Test