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spinal tap (lumbar puncture)

a spinal tap (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 colourless 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. and it may be used to drain fluids that build up as a result of certain medical conditions.

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

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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