What is a syphilis diagnostic test

Syphilis detection is divided into initial screening test and diagnostic test. General initial screening test detection is (+, then you need to do Treponema pallidum confirmatory test, confirmatory test is generally used Treponema pallidum specific antibody agglutination test is also TPPA. TPPA this kind of experiment if (+, then do rapid plasma reagin test, TRUST, only TPPA and TRUST are positive in order to make the exact diagnosis of syphilis, can be diagnosed as syphilis infected persons, if the simple initial screening test is not as syphilis diagnosis, so that the initial screening test (+ need to do the diagnostic test later, only TPPA and TRUST these two (+, then can make the exact diagnosis of syphilis.