Treponema Pallidum Haemagglutination Assay (TPHA)
TPHA is a confirmatory blood test that specifically detects antibodies against the bacterium that causes syphilis. It's typically used to confirm a positive RPR or VDRL screening result.
Venereal Disease Research Laboratory (VDRL)
VDRL is a screening blood test that detects antibodies associated with syphilis infection. Similar to RPR, it's used as an initial screening test, with confirmatory testing recommended for positive results.