This document discusses lumbar puncture (spinal tap) procedures. It describes how a lumbar puncture is performed to withdraw cerebrospinal fluid (CSF) for diagnostic purposes such as testing for meningitis or tumors. The key steps of the procedure are outlined, including positioning and restraining the patient, cleaning the site, administering local anesthetic, inserting the needle into the subarachnoid space to collect CSF samples, and monitoring the patient afterwards. Potential complications are also listed.