<prompt> Best confirmatory test for syphilis isRPRGram stainVDRLFTA-ABS  <response>: FTA-ABS: FTA-absorption test in which the test serum is preabsorbed with sonicate of the Reiter treponemes to eliminate group-specific reactions. FTA-ABS is as specific as the TPI test and is now accepted as a standard reference test. Ref: Textbook of microbiology; Ananthanarayan and panikers; 10th edition; Pg:382 