VDRL Test
Infection · Blood
Available at 0 labs
No lab currently offers this test.
About this test
What is the VDRL Test?
The Venereal Disease Research Laboratory (VDRL) test is a screening blood test that detects antibodies produced in response to the bacterium Treponema pallidum, the cause of syphilis. It is a non‑specific test that looks for a substance called cardiolipin that is released when cells are damaged by the infection.
Key Parameters
| Parameter | What it shows |
|---|---|
| VDRL titre | The level of antibodies; higher titres suggest active or recent infection |
Why the Test is Done
- Routine screening for syphilis in high‑risk populations (e.g., sexually active adults, pregnant women, people with HIV).
- Evaluation of symptoms such as rash, ulcers, or neurological signs that may indicate syphilis.
- Monitoring treatment response in patients who have been treated for syphilis.
Early Detection
The VDRL test can help identify signs of syphilis, but it does not diagnose the disease on its own. A doctor interprets the result together with symptoms, medical history, and confirmatory tests such as FTA‑ABS or TP‑PA.
What an Abnormal Result Means
- A high titre may indicate an active or recent syphilis infection, but it can also be seen in other conditions (e.g., lupus, hepatitis, pregnancy, or certain infections).
- A low or negative result does not rule out syphilis, especially in early infection or in cases where the immune response is weak.
- Many factors—hydration status, medications, recent infections—can influence antibody levels.
Who Might Be Advised to Get This Test
- Individuals with new or multiple sexual partners.
- Pregnant women, to prevent congenital syphilis.
- Persons with HIV or other immunocompromising conditions.
- Healthcare workers or others with occupational exposure risk.
Summary: The VDRL test is a quick blood screening tool for syphilis that helps doctors decide whether further confirmatory testing is needed.
Used for detecting / monitoring
Before your test
No fasting is required for the VDRL test. If you are also having a fasting test (e.g., blood glucose), follow the fasting instructions for that test.
Procedure: A healthcare professional will draw a small amount of blood (usually 5–10 mL) from a vein in your arm using a needle. The process takes about 5 minutes. You may feel a brief pinch when the needle is inserted.
Precautions: No special precautions are needed. If you are taking medications, inform the clinician; most drugs do not affect the VDRL result. Stay hydrated and avoid excessive alcohol or strenuous exercise on the day of the test.
Please confirm any specific preparation with your doctor or the laboratory. This information is for educational purposes only and is not a substitute for professional medical advice.
Sample type: Blood
Report parameter guide
VDRL Test
A screening test for syphilis that detects antibodies produced in response to the infection
High: A positive result may indicate an active or recent syphilis infection, or it could be a false positive due to other conditions such as autoimmune diseases, pregnancy, or certain infections