<prompt> The test is done to diagnose syphilis in a newborn if the mother is syphilitic isSyphilis Capita M testDetection of IgGZN stainingFluorescent antigen test  <response>: Diagnosis of congenital syphilisIt involves Dark ground Microscopy and VDRL.As IgM does not cross the placenta, its presence in neonatal serum confirms congenital syphilis and helps to differentiate it from seropositivity due to passively transferred maternal antibodies. The tests to detect IgM are-FTA-ABS 19S IgM FTA-ABSSyphilis Capita M testRefer: Nelsons Textbook of Pediatrics, SAE, 1st edition, pg no. 1475-1477 