The OnSite^® Syphilis Ab Combo Rapid Test is a lateral flow chromatographic immunoassay for the qualitative detection of antibodies (IgG, IgM, and IgA) to Treponema pallidum (Tp), also known as Syphilis, in human serum, plasma, or whole blood. This antibody detection test is an easy-to-use diagnostic method and can be performed within 15 minutes, without using laboratory equipment.