<prompt> In first 8 weeks of syphilis the most specific test isVDRLKahnTPIFTA-ABS  <response>: The fluorescent treponemal antibody absorption FTA-ABS test is a blood test that checks for the presence of antibodies to Treponema pallidum bacteriaduring first 8weeks of infection. These bacteria cause syphilis. Syphilis s a sexually transmitted infection STI thats spread through direct contact with syphilitic sores. Ref Harrison20th edition pg 1234 