<prompt> Congenital syphilis can be best diagnosed by-IgMFTA-ABSIgGFTA-ABSVDRLTPI  <response>: Ans. is a i.e., IgM FT A - ABS As Ig M does not cross placenta, its presence in neonatal serum confirms congenital syphilis and helps differentiating it from seropositivity due to passively tranfered maternal antibodies. The tests to detect IgM are FTA-ABS 19S IgM FT A-ABS Syphilis Capita M testFor measurment of IgM in neonate in whom congenital syphilis is suspected, the syphilis capita M test and the 19S IgM FTA-ABStest are available. - Harrison 16the 982Note - 15the Harrison says, No commercially available IgM test is recommeded forevaluation of infant with suspected congenital syphillis --- Harrison 17the 1043 