neurologic disorders
How To Do Lumbar Puncture
Introduction
In lumbar puncture (LP), a needle is inserted into the lumbar subarachnoid space to collect cerebrospinal fluid (CSF) for laboratory testing, to measure CSF pressure, and sometimes to give intrathecal diagnostic or therapeutic agents. When it is difficult to palpate landmarks (eg, because of obesity), lumbar puncture can be done by a neuroradiologist using fluoroscopic guidance. Ultrasonography can also be used to identify landmarks and, less commonly, to guide needle placement in real time if equipment and personnel are available. However, ultrasonography is still not commonly used outside of teaching centers. (See also Lumbar Puncture (Spinal Tap) , 