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The CSF-VDRL test is used to diagnose neurosyphilis. This test looks for antibodies called reagins, which are sometimes produced by the body in reaction to the syphilis-causing bacteria.
See also: VDRL
Alternative NamesVenereal disease research laboratory slide test - CSF
How the test is performedThe test is performed on a CSF sample obtained by lumbar puncture (spinal tap).
How to prepare for the testBefore the procedure, you will be asked to review the risks and sign a consent form.
How the test will feelUsually, discomfort associated with the lumbar puncture is mild to moderate. The entire procedure usually takes about 30 minutes but may take longer. The actual fluid collection only takes a few minutes.
Why the test is performedThe CSF-VDRL test is used to diagnose syphilis in the brain or spinal cord. Brain and spinal cord involvement usually indicates late stage (tertiary) syphilis.
Blood screening tests, such as VDRL and RPR, are more effective during middle stage (secondary) syphilis.
Normal ValuesA negative result is normal.
However, false-negatives can occur. This means you can have syphilis and have a normal CSF-VDRL test result. Therefore, a negative test does not always rule out the disease. Other markers of inflammation, such as elevated protein levels or excess white blood cells, may be used to diagnose neurosyphilis.
What abnormal results meanA positive result is abnormal and indicates neurosyphilis.
What the risks areRisks of lumbar puncture include:
- Hypersensitivity (allergic) reaction to the anesthetic
- Discomfort during the test
- Headache after the test
- Bleeding into the spinal canal
- Brain herniation (if performed on a person with increased intracranial pressure) which may result in brain damage or death
- Damage to the spinal cord or nerve roots
Hook EW III. Syphilis. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 340.
Fletcher JJ, Nathan BR. Cerebrospinal fluid and intracranial pressure. In: Goetz, CG, eds. Textbook of Clinical Neurology. 3rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 26.
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