However, they can perform the test using a sample of CSF. A blood draw involves a healthcare provider inserting a hollow needle into a vein in the elbow or on the back of the hand. A healthcare provider may tie a rubber band, or tourniquet, above the injection site before inserting the needle to make the veins easier to locate.
Healthcare providers collect samples of CSF through a procedure known as a lumbar puncture or spinal tap. Then they will insert a spinal needle into the lower spine, which they use to extract a small quantity of CSF. The test can take 3—5 days. However, people who have a high risk of syphilis may want to consider getting routine screening tests about every 3 months.
The VDRL blood test is not always accurate. Infections, such as HIV or pneumonia , as well as other autoimmune disorders, can trigger a false-positive result. If the result is positive, a doctor will perform another test, such as the fluorescent treponemal absorption assay.
This test will be able to confirm whether the infection is syphilis. If a person receives a positive result, a doctor will typically perform a treponemal test, which detects the antibodies to the T Pall i dum proteins. If this is positive, it indicates that syphilis has infected the central nervous system. Sometimes, however, doctors test for syphilis in reverse. They will begin by testing a person with a syphilis-specific treponemal test. If this proves positive, they will follow it up with a nontreponemal test, such as a VDRL.
The VDRL test offers a safe and convenient way to screen for syphilis infections. The test itself does not carry any significant risks. However, there may be some slight complications associated with the process of drawing blood and lumbar punctures. Privacy Policy Disclaimer Contact. Prathap C. Reddy Ms. Preetha Reddy Ms. Shobana Kamineni Ms.
Suneeta Reddy Dr. Overview: The venereal disease research laboratory VDRL test is used to detect if a person has been infected with the bacteria causing syphilis, which is a sexually transmitted disease. Your doctor may test your spinal fluid if they suspect that your infection has spread to your brain.
You do not have to stop taking medicines or fast before the test unless stated by your doctor. If your blood sample test shows negative, then your blood does not contain syphilis antibodies, and you are not infected with the bacteria. If your test shows positive results for syphilis antibodies, you may have syphilis. However, your doctor will recommend another test called the treponemal test to confirm your result.
This test is performed to check whether your immune system has produced specific antibodies as a result of coming in contact with the syphilis-causing bacterium. The VDRL test may not be accurate in some cases. The VDRL test is a screening test for syphilis. It measures substances proteins , called antibodies , which your body may produce if you have come in contact with the bacteria that cause syphilis.
Blood is drawn from a vein venipuncture , usually from the inside of the elbow or the back of the hand. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. Preparation may vary depending on the specific test. The test is most often done using a blood sample. It can also be done using a sample of spinal fluid. This article discusses the blood test. When the needle is inserted to draw blood, some people may feel moderate pain. Others feel only a prick or stinging.
Afterward, there may be some throbbing or a slight bruise.
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