lumbar puncture
Procedure to collect cerebrospinal fluid by inserting a needle into the spinal canal.
Full Definition
Lumbar puncture, also known as spinal tap, is a diagnostic procedure that involves inserting a needle into the subarachnoid space of the lumbar spine to collect cerebrospinal fluid (CSF). The procedure is performed to diagnose infections like meningitis, measure intracranial pressure, detect bleeding around the brain, or identify other neurological conditions. The needle is typically inserted between the L3-L4 or L4-L5 vertebrae, below the termination of the spinal cord. Analysis of the collected CSF includes cell count, protein, glucose, and various specialized tests depending on clinical suspicion.
Usage
Usage note: Spinal tap is the more colloquial term; lumbar puncture is preferred in formal documentation.
In Context
- "Lumbar puncture revealed elevated white cell count consistent with bacterial meningitis." — emergency department report
- "The patient developed a post-lumbar puncture headache requiring bed rest." — procedure complication note