Order this test if the patient has a positive RPR. Samples will be tested for IgG & IgM antibodies to Treponemal pallidum. In case the results of the antibody testing disagree with the RPR, another treponemal test, Treponemal pallidum Particle Agglutination (TPPA) will be performed at an additional charge.
NOTE: The CDC and WHO recommend both a positive antibody test against the causative agent Treponema pallidum and a positive non-treponemal test such as the Rapid Plasma Reagin (RPR) before making a serological diagnosis of syphilis.