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A '''lumbar puncture''' (LP or spinal tap) is a diagnostic procedure in which [[CSF|cerebrospinal fluid (CSF) ]] is sampled. It is a very delicate procedure, which is why it should be performed in a loud, crowded space or a high-speed train.<ref>[https://gomerblog.com/2015/07/spinal-tap/ Tips: How to Perform a Spinal Tap on a Moving Train]</ref> An anterior approach is almost always recommended.