RPR (Rapid Plasma Reagin)
RPR is a screening test for syphilis that detects antibodies to tissue damage caused by the bacterium Treponema pallidum. A positive result requires confirmatory testing. Results are confidential.
- Free home collection
- Physician-reviewed report
24 Hours
Turnaround
Blood
Sample
What the RPR (Rapid Plasma Reagin) test tells you
RPR is a screening test for syphilis, and it works indirectly. Rather than finding Treponema pallidum, the bacterium that causes the infection, it detects a class of antibody the body produces in response to material released from cells during the illness. Two things follow from that design, and both matter before you read a result. The first is that RPR is very good at not missing infections. The second is that a reactive RPR is not a diagnosis of syphilis: it is a signal that a second, more specific test is needed.
Because the antibodies RPR detects are not unique to syphilis, other situations can produce them. Pregnancy, autoimmune conditions such as lupus, and some viral and parasitic infections are recognised causes of a reactive result in someone who does not have syphilis at all; these are known as biological false positives and they are not rare enough to ignore. A treponemal test such as TPHA, which looks for antibodies aimed at the bacterium itself, is what separates the two. Reactive on both tests supports a diagnosis; reactive on RPR alone usually points to a false positive. Nothing is concluded from RPR by itself.
RPR also does something treponemal tests cannot. Treponemal antibodies stay positive for life, so they cannot show whether treatment has worked. RPR is reported with a level that falls after successful treatment and can rise again with reinfection, which makes repeat RPR the standard way of following someone through and after therapy. Your doctor reads the direction of travel over time rather than any single figure. And the news that matters most: syphilis is curable with antibiotics, and treatment is more straightforward the earlier it is given.
Routine syphilis screening in STI clinics, prenatal care, blood donation screening, and when symptoms of syphilis (chancre, rash) are present.
- Screens for syphilis
It is a sensitive first-line test that identifies who needs confirmatory testing, and it is included in most routine sexual health checks.
- Follows response to treatment
The RPR level falls after effective treatment and can rise again with reinfection, so repeat testing is how response is judged.
- Routine in pregnancy care
Untreated syphilis in pregnancy can seriously affect the baby, and screening allows treatment to be given in good time.
- Explains unclear symptoms
Syphilis produces varied signs that mimic other conditions, so testing is often the quickest way to include or exclude it.
Reasons your doctor may request the RPR (Rapid Plasma Reagin) test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Routine sexual health screening
- Routine sexual health screening, usually alongside HIV and other tests.
Ulcers, rash & swollen glands
- A painless ulcer, a widespread rash that can involve the palms and soles, or unexplained swollen glands.
Pregnancy, partner diagnosis & treatment follow-up
- Antenatal screening, and again later in pregnancy where your doctor advises it.
- A partner diagnosed with syphilis.
- Follow-up after syphilis treatment, to confirm the level is falling as expected.
Non-Reactive / Negative means no reagin antibodies were detected. It has no separate list of causes, though it can occur very early in infection, in late latent disease, and occasionally when an unusually strong antibody response interferes with the reaction. Reactive / Positive means the antibody was found: a screening signal, not a diagnosis. RPR detects an indirect antibody response rather than the syphilis bacterium, so a confirmatory treponemal test such as TPHA always follows. Biological false positives are well recognised in pregnancy, in autoimmune conditions such as lupus and antiphospholipid syndrome, and in some infections. A reactive result may also reflect recent treatment whose level has not yet fallen, reinfection, or a low-level reaction lasting years after successful treatment. Your doctor reads it with the confirmatory test, your examination and your history.
RPR (Rapid Plasma Reagin)
Non-Reactive / Negative means no reagin antibodies were detected. It has no separate list of causes, though it can occur very early in infection, in late latent disease, and occasionally when an unusually strong antibody response interferes with the reaction. Reactive / Positive means the antibody was found: a screening signal, not a diagnosis. RPR detects an indirect antibody response rather than the syphilis bacterium, so a confirmatory treponemal test such as TPHA always follows. Biological false positives are well recognised in pregnancy, in autoimmune conditions such as lupus and antiphospholipid syndrome, and in some infections. A reactive result may also reflect recent treatment whose level has not yet fallen, reinfection, or a low-level reaction lasting years after successful treatment. Your doctor reads it with the confirmatory test, your examination and your history.
No infection or antibodies detected: a negative result.
Detected: a positive result. Please consult your physician for confirmation and next steps.
This test is reported descriptively rather than on a numeric scale: each finding below explains what your report may say.
This information is for general education only and is not medical advice. Reference ranges can vary by laboratory, age, sex, and individual factors. Always consult your physician or doctor to interpret your results.
What a higher result can point to
- Untreated syphilis, at any stage of the infection.
- Recently treated syphilis, where the level has not yet had time to fall.
- Reinfection or relapse in someone treated before, shown by a level that rises again.
- A biological false positive from pregnancy or from an autoimmune condition such as lupus or antiphospholipid syndrome.
- Other infections, including some viral illnesses and malaria, that provoke the same class of antibody.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.
What this test cannot tell you
- A reactive result is not a diagnosis. RPR is not specific to syphilis, and confirmatory treponemal testing such as TPHA must follow before anything is concluded.
- A non-reactive result has no separate list of causes; it can also occur very early in infection, in late latent disease, and occasionally when an unusually strong antibody response interferes with the reaction itself.
- It cannot stage the infection or say when it was acquired: that comes from examination and history.
- Some people keep a persistent low-level reactive result for years after being cured, which does not mean treatment failed.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1A reactive RPR is a screening signal, not a diagnosis: a confirmatory treponemal test always comes next.
- 2Biological false positives are well recognised, particularly in pregnancy, autoimmune conditions and some infections.
- 3RPR detects an indirect antibody response rather than the syphilis bacterium itself.
- 4The level, followed over time, is how treatment response and reinfection are judged.
- 5Syphilis is curable with antibiotics, and treatment is simpler the earlier it is started.
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Frequently Asked Questions
Everything you need to know about the RPR (Rapid Plasma Reagin) test. Can't find what you're looking for?
Talk to our team→Not on its own, and this is important. RPR is deliberately broad and reacts to a type of antibody that pregnancy, autoimmune conditions and some other infections can also produce. A confirmatory treponemal test is what separates true infection from a false positive, so wait for that result before concluding anything.
Treponemal antibodies stay positive for life and so cannot show whether treatment worked. RPR levels move (falling after effective treatment and rising with reinfection), which is why your doctor compares results over time rather than reading one in isolation.
Often it does, particularly when the infection was treated early. Some people keep a low reactive result indefinitely, and your doctor reads that as a stable pattern rather than as continuing infection.
Yes. Very early infection, before the antibody response has developed, and some later stages of the disease can both give a non-reactive result. That is one reason testing is repeated when the clinical picture still suggests syphilis.
RPR is a screening test for syphilis that detects antibodies to tissue damage caused by the bacterium Treponema pallidum. A positive result requires confirmatory testing. Results are confidential.
Routine syphilis screening in STI clinics, prenatal care, blood donation screening, and when symptoms of syphilis (chancre, rash) are present.
No, fasting is not required for the Syphilis Screen (RPR) test, so you can eat and drink normally beforehand.
The Syphilis Screen (RPR) test uses a blood sample, collected quickly by our DHA-licensed phlebotomist with minimal discomfort.
Results for the Syphilis Screen (RPR) test are typically ready within 24 hours. You will receive a secure digital report, and your Smart Report highlights anything outside the normal range.
The Syphilis Screen (RPR) test is AED 170, which includes free home sample collection and a physician-reviewed report. You can also build a custom panel and pay only for the markers you choose.
Yes. A DHA-licensed phlebotomist can collect your sample at home or the office anywhere in Dubai at no extra cost, 7 days a week. See how it works.
It is commonly chosen by sexually active adults. If you are not sure it is right for you, our care team is happy to advise.
Add the Syphilis Screen (RPR) test to your cart and complete the short booking wizard, choosing home collection or a lab visit. Guest checkout lets you book without creating an account.
Yes. It is processed at our EIAC-accredited laboratory (ISO 15189:2022) under DHA license 0046381 and verified by board-certified pathologists.
Every report includes reference ranges and plain-language notes. If you have questions, our care team can arrange a clinician review: just get in touch.
Absolutely. Add it to a curated health package or bundle it with any of our 160+ biomarkers, often from a single sample in one visit.