Lumbar PunctureCreate a free account to sign-in. Medscape - Reference - Lumbar Puncture - Go to the "Multimedia Library" to see the images and videos - Author(s): Gil Z Shlamovitz, MD, Nirav R Shah, MD, MPH, Helmi L Lutsep, MD , Andrew K Chang, MD, Luis M Lovato, MD, and Mary L Windle, PharmD - "Lumbar puncture is a procedure that is often performed in the emergency department to obtain information about the cerebrospinal fluid (CSF).[1, 2, 3, 4] Although usually used for diagnostic purposes to rule out potential life-threatening conditions (eg, bacterial meningitis or subarachnoid hemorrhage), it is also sometimes used for therapeutic purposes (eg, treatment of pseudotumor cerebri). CSF fluid analysis can also aid in the diagnosis of various other conditions (eg, demyelinating diseases and carcinomatous meningitis)."