{"id":"rpr","name":"RPR (Rapid Plasma Reagin)","shortName":"RPR","aliases":["RPR","Rapid Plasma Reagin","Syphilis RPR","RPR with Reflex to Titer","RPR, Qualitative","RPR Titer","RPR titre","RPR Screen with Reflex to Titer","RPR, Quant","Rapid Plasma Reagin Screen","Syphilis: RPR With Reflex to RPR Titer","RPR Screen w/ Reflex","Reagin Antibody"],"abbreviations":["RPR"],"loinc":[{"code":"20507-0","primary":true},{"code":"31147-2","primary":false}],"specimen":"serum","units":[],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A blood test used to help find syphilis and to follow its treatment. A reactive result needs a second, more specific test to confirm it.","url":"https://bloodtesttracker.com/markers/rpr","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}