The full name of TPPA is treponemapallidumparticleagglutinationtest, and the Chinese name is syphilis spirochete gelatin agglutination test. It can be produced during the incubation period of syphilis (about 2 weeks after infection) and is often used as a confirmatory test for syphilis spirochete infection because of its high specificity. It is an important test to determine if you have been infected with syphilis. It has no greater significance for determining the condition of syphilis, and most patients can still have a positive TPPA for life after their syphilis is cured. If the TPPA test result is negative, syphilis can be basically excluded, but the very early stage of syphilis can also be negative. a positive TPPA test result should be followed by a non-specific syphilis spirochete antigen serological test (RPR, TRUST, etc.). If the result is still positive, the diagnosis can be confirmed. For patients who have had syphilis in the past and received regular treatment, as long as the RPR or TRUST is negative and there is no recurrence at the 2-year follow-up, the syphilis is clinically cured, the pathogen has been cleared and is no longer infectious, and there is no need for further diagnosis and treatment, and a positive TPPA is usually accompanied for life. Clinically, in rare cases, a false positive reaction to TPPA may also occur. TPPA results need to be combined with serological test results such as RPR or TRUST.