The Syphilis (RPR + FTA-ABS) panel contains 2 tests with 2 biomarkers. Syphilis (RPR + FTA-ABS)FTA-ABS - Treponema pallidum Ab (Confirmation for Syphilis RPR test).Syphilis RPR ( RPR (Monitor) with Reflex to Titer)FTA-ABS - Treponema pallidum AbClinical SignificanceThe FTA-ABS is a specific treponemal assay to detect antibody to t. Pallidum. The FTA-ABS becomes reactive 4-6 weeks after infection. Unlike the nontreponemal tests, once the FTA-ABS test becomes reactive, it will remain reactive for many years. Since the reactivity found with the FTA-ABS does not indicate response to therapy