RPR (Rapid Plasma Reagin) Syphilis Blood Test

RPR (Rapid Plasma Reagin) Syphilis Blood Test

Quick Overview

Test for syphilis.

Test #799


Availability: In stock

Also Known As Syphilis; Nontreponemal Test; Rapid Plasma Reagin Test; RPR; STS; Syphilis Serology; RPR Titer
Preparation No special preparation required.
Test Results 1-2 days. May take longer based on weather, holiday or lab delays.

The Quantitative Rapid Plasma Reagin Test, also known as an RPR Test, is useful in the diagnosis of the sexually transmitted disease syphilis and monitoring of its treatment.

The RPR Test is also known as Rapid Plasma Reagin. No fasting is required for this blood test, and results will be delivered within 1-2 days. This is a quick, low-cost, confidential alternative to a doctor visit. No insurance is required to order this test.

Syphilis is usually spread by sexual contact, such as through direct contact with a syphilis sore (chancre). These sores are firm, raised and painless, and typically appear on the genitals or in the throat. Caught early, syphilis is easily treated. If left untreated, the disease may be passed to sexual partners and cause severe health problems. A pregnant woman can also pass the disease to her fetus, with serious and potentially fatal consequences for the infant.

The Syphilis RPR test is typically ordered as an initial screening for Syphilis.  A positive result for this test is typically followed up with a Syphilis FTA-Abs test.  An RPR test can also be used as a follow-up to treatment to see if a person’s antibody levels have gone down.  Results for this test are quantitative and may show a low positive value, even after effective treatment. 

Syphilis is treated with antibiotics in early stages of infection, and newly acquired infections tend to be easily cured. Treatment may take longer in patients who have been infected for more than a year. Following treatment, syphilis antibodies should be lower. If antibodies remain the same, a persistent infection may be present. Higher antibodies may indicate reinfection. Quantitative RPR Test results are reported as reactive or nonreactive at dilutions of 1:1, 1:2, 1:4, 1:8, 1:16, 1:32, 1:64, etc.

A negative RPR Test result does not mean the patient is free of syphilis, particularly if the exposure was recent. It can take up to several weeks for antibodies to reach detection levels in the blood. As a result, repeat RPR testing may be required at a later date.

Average incubation period for syphilis ranges from 10-90 days, while most people show detectable antibody levels by 6 weeks with this syphilis testing.

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