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Lumbar Puncture

A lumbar puncture is a procedure in which a needle is inserted into the spinal canal to measure the pressure and obtain a sample of cerebrospinal fluid (CSF), the colorless fluid that surrounds the brain and spinal cord. The procedure may also be used to inject anesthetics, medicine, or a contrast dye (for spinal X-rays) into the spinal fluid or to drain fluids that accumulate as a result of certain medical conditions.

Fluid samples obtained from a lumbar puncture can be analyzed for signs of infection (such as meningitis), inflammation, cancer, or bleeding in the area around the brain or spinal cord.

A lumbar puncture is also sometimes called a spinal tap.

ByHealthwise Staff
Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine
Specialist Medical ReviewerJoseph O'Donnell, MD - Hematology, Oncology
Last RevisedAugust 30, 2012

WebMD Medical Reference from Healthwise

Last Updated: August 30, 2012
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