What is lumbar puncture?

An overused diagnostic test from the show "House" used similar to the meme barrel roll.

DO A LUMBAR PUNCTURE!!!!11
DO A LUMBAR PUNCTURE!!!!11
DO A LUMBAR PUNCTURE!!!!11
DO A LUMBAR PUNCTURE!!!!11DO A LUMBAR PUNCTURE!!!!11 do a Lumbar Puncture !!!111!11!!!!1!

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lumbar puncture - video