Can this result diagnose a condition on its own?

No. The result should be interpreted with symptoms, medical history, assay method and related tests.

Which reference range should I use?

Use the performing laboratory's own reference or decision range and reporting method first.

When should I discuss the result with a healthcare professional?

Reactive/positive, clearly abnormal, persistent or symptom-associated results should be reviewed by a healthcare professional.

Information about a laboratory test

RPR / VDRL What Does This Test Mean?

RPR / VDRL measures a nontreponemal antibody response using RPR or VDRL testing.

Test summary

Test name: RPR / VDRL
Abbreviations: RPR, VDRL
Category: Infectious Disease / STI
Panel: Syphilis Serology
Specimen: Serum / plasma
Common units: qualitative, titer

What does the test measure?

RPR / VDRL measures a nontreponemal antibody response using RPR or VDRL testing.

Why is the test ordered?

RPR / VDRL is used with treponemal tests for syphilis screening and to follow changes in titer after treatment.

Information about a low result

A negative/nonreactive RPR or VDRL result does not exclude syphilis in every stage or circumstance.

Information about a high result

A positive/reactive RPR or VDRL result is not sufficient by itself to diagnose syphilis and requires a treponemal test.

Reference and clinical context

Start with the performing laboratory's reference or decision range, assay method, specimen and reporting unit. A single result usually does not establish a diagnosis on its own.

Reference range 1

Population: Nontreponemal syphilis screening context
Specimen: Serum / plasma
Method: RPR / VDRL

Sourced reference/decision context for RPR / VDRL

This is sourced reference or clinical-context information; the user's own laboratory report, assay method and clinical context take priority.

Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.

Interpretation notes

CDC recommends using both a nontreponemal and a treponemal serologic test for presumptive syphilis diagnosis.

Related specialties

Infectious Disease
Dermatology
Obstetrics and Gynecology

Frequently asked questions

More information about this test

Sources

Getting Tested for HIV — Centers for Disease Control and Prevention
U.S. government clinical reference · 2025 · HIV antigen/antibody testing and window period · Verified: Aug 12, 2026
Syphilis Tests — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2025 · Syphilis serologic testing and follow-up · Verified: Aug 12, 2026
CDC Laboratory Recommendations for Syphilis Testing, United States, 2024 — Centers for Disease Control and Prevention
U.S. government laboratory recommendation · 2024 · RPR/VDRL and treponemal testing algorithms · Verified: Aug 12, 2026