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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.
The size or bore of the needle can be a reason as well. This depends on how it is done and by the skill of the person doing it as well as whether there are significant degenerative changes present or a spinal deformity. Obesity can make it more difficult to do and the reason for the spinal tap may affect the result. The size or bore of the needle can be a reason as well. This depends on how it is done and by the skill of the person doing it as well as whether there are significant degenerative changes present or a spinal deformity.