TPPA indicator is mainly used to determine whether the infection is syphilis, if the infection is syphilis, whether it is treated or not, TPPA results will continue to be positive, even lifelong positive, even after the regular anti-syphilis treatment, has killed the syphilis spirochete, TPPA indicators will continue to be positive. Some hospitals will do the TPPA titer, that is, how high the TPPA is, this high is only a reference, it is not used as an indicator to judge the disease regression or to judge the assessment of efficacy, the assessment of efficacy indicators to use RPR rather than TPPA, TPPA only indicates the presence or absence of infection.