RPR test for syphilis: what to know

RPR detects antibodies associated with syphilis rather than detecting the bacterium directly. A non-reactive result lowers the likelihood of infection, but recent exposure can mean testing is too early. A reactive result may reflect syphilis, a past treated infection or a result that needs clarification. Clinicians compare it with a treponemal test, symptoms, examination findings and previous results.

Syphilis can be transmitted through sexual contact and may progress through stages. Some people have no obvious symptoms. Testing is therefore useful after a relevant exposure, when symptoms suggest infection, or as part of sexual-health care.

Arrange a review of any reactive result rather than trying to interpret the RPR number alone. Ask whether confirmatory testing is complete and whether testing for other sexually transmitted infections is appropriate. Until your clinician gives advice, avoid sexual contact or use protection consistently, and tell recent partners that they may need assessment. If syphilis is confirmed, take prescribed treatment exactly as directed and attend follow-up testing.

Seek prompt sexual-health care after a reactive RPR, a partner’s diagnosis, or a painless sore, rash on the palms or soles, swollen glands or unexplained visual or hearing changes. Get urgent medical help for sudden vision loss, severe headache, weakness, confusion or marked unwellness. These signs can have causes besides syphilis, but they should not wait for routine review.

Ask whether the RPR is reactive, which confirmatory test was used, whether treatment is needed, when follow-up is due and how partners can access confidential testing.