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Lumbar puncture. Lumbar puncture (LP), also known as a spinal tap, is a medical procedure in which a needle is inserted into the spinal canal, most commonly to collect cerebrospinal fluid (CSF) for diagnostic testing. The main reason for a lumbar puncture is to help diagnose diseases of the central nervous system, including the brain and spine.
How bad is a Spinal Tap or Lumbar Puncture? Why don't physicians apply a nerve block/epidural during a lumbar puncture? Other than a lumbar puncture, what are some medically approved ways to extract cerebrospinal fluid (CSF)?