They include the following: Fluorescent treponemal antibody absorption (FTA-ABS) test Microhemagglutination assay for antibodies to T pallidum (MHA-TP) T pallidum hemagglutination assay (TPHA) T pallidum enzyme immunoassay (TP-EIA) Chemoluminescence immunoassays (CLIA) If they do not confirm treponemal infection after a positive reaginic test, the reaginic result is deemed biologically false-positive.