HI Thanks for posting your query to Healthcaremagic. First thing , if you TPHA is positive it is sure that you are having or had syphilis and hence going on treatment was the right decision. But repeating the same TPHA test to know whether your syphilis has been cured or not is a wrong advise as TPHA once becomes positive remains positive whole life inspite of a successful treatment . So to check whether the treatment was successful or not , you need to get a test called VDRL test . This test will show negative or normal values if the treatment has been successful . Hope this answers your query Any clarifications feel free to ask .