lumbar puncture
Diagnostic procedure involving insertion of needle into spinal canal to obtain cerebrospinal fluid for analysis.
Full Definition
Lumbar puncture (LP) is a diagnostic and sometimes therapeutic procedure in which a needle is inserted into the subarachnoid space of the lumbar spine to obtain cerebrospinal fluid (CSF) for analysis. In pediatric infectious disease, LP is crucial for diagnosing central nervous system infections such as bacterial and viral meningitis. The procedure requires careful technique and appropriate sedation in children. CSF analysis includes cell count, protein, glucose, Gram stain, and culture, with additional tests ordered based on clinical suspicion.
Usage
Usage note: Preferred formal term over 'spinal tap' in medical documentation. Abbreviate as LP after first use.
In Context
- "Lumbar puncture revealed elevated white cell count consistent with bacterial meningitis." — hospital discharge summary
- "The procedure note should specify lumbar puncture rather than the informal 'spinal tap' in medical records." — documentation standard