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*  Nontreponemal tests for syphilis - Wikipedia
... test. Both these test are flocculation type tests that use an antigen-antibody interaction. The complexes remain suspended in ... Nontreponemal tests are screening tests, very rapid and relatively simple, but need to be confirmed by treponemal tests. ... approved standard tests include the VDRL slide test, the rapid plasma reagin (RPR) card test, the unheated serum reagin (USR) ... Nontreponemal test refers an indirect method of blood test for diagnosis of infection with syphilis. Nontreponemal tests detect ...
  https://en.wikipedia.org/wiki/Nontreponemal_tests_for_syphilis