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Non-Treponemal Rapid Plasma Reagin (RPR) Test

Published: August 9, 2026Updated: August 16, 2026

This test measures the presence of antibodies that may indicate exposure to certain bacteria, often used in screening for syphilis or other infections.

Quick summary

["The RPR test helps detect early signs of infections that your body has fought off, including some bacterial infections."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
75172-7
Short code
FIRSTNONTREPONEMALTESTTITER
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

This test measures specific substances, markers, or cells in your body that can reveal important information about how well your organs are working, whether an infection or other condition is present, and how your overall health is doing over time.

The RPR test looks for antibodies in your blood that react with a specific substance (not the actual bacteria). These antibodies can appear after your body has been exposed to bacteria like those causing syphilis or other infections. This test is typically used as a screening tool rather than a definitive diagnosis.

Your healthcare provider may order this test to help diagnose a medical condition, monitor a health problem you already have, screen for disease before symptoms develop, or check how well your current treatment plan is working for you.

Doctors may order an RPR test if you have symptoms like sores, rashes, or other signs of infection, or if you have risk factors for certain infections. It’s also sometimes used as part of routine testing in certain medical situations.

A trained professional will collect your sample at a clinic, laboratory, or hospital. Depending on the type of test, this may involve drawing a small amount of blood from a vein in your arm, collecting a urine sample, or using a swab, and the process usually takes only a few minutes.

A blood sample is taken from a vein in your arm using a small needle. You may feel a slight pinch, but it usually doesn’t cause much discomfort. The blood is then sent to a lab for testing.

After your sample is collected, you can typically return to your normal daily activities right away. The specimen is sent to a laboratory for analysis, and your results are usually ready within a few days. Your healthcare provider will review them with you and explain what they mean.

After your blood is drawn, you can usually return to your normal activities immediately. There may be a small bruise or slight pain at the injection site, but this typically goes away quickly.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

RPR Test

Frequently asked questions

The RPR test is primarily used as a screening tool to detect early signs of infections that may require further testing or treatment. While it can indicate past or current exposure, it does not always confirm the specific infection. A positive result may prompt additional tests to identify the exact cause.
What does a positive or negative result mean for my health, and what follow-up steps might my doctor recommend after I receive the result?
A positive RPR test suggests your body has produced antibodies in response to an infection, but it doesn’t always mean you have an active infection. It may indicate past exposure or an ongoing infection that needs further evaluation. Always discuss your results with your healthcare provider.
How often should I get this test, and how frequently does my doctor recommend repeating it to keep track of my health over time?
The frequency of this test depends on your medical history, symptoms, and risk factors. Your healthcare provider will determine if and when you need retesting. Follow their guidance closely.
No special preparation is needed for the RPR test. You can eat, drink, or take your usual medications as usual. However, inform your healthcare provider about any medications you’re taking, especially blood thinners, to ensure they can interpret your results accurately.
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy