Health Library Search

Health Library

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 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. 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.

Current as of: December 20, 2023

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

© 2017-2025 Healthwise, Incorporated. This information does not replace the advice of a doctor.