Diagnostic and therapeutic large volume CSF removal
30-50 mL of CSF with documentation of patient's gait (speed, stride length, number of steps to turn 180 deg) before and within 30-60 minutes after procedure
Additional work up warranted for surgical candidate 
Assessment for Surgical CSF shunting
30-50 mL of CSF with documentation of patient's gait (speed, stride length, number of steps to turn 180 deg) before and within 30-60 minutes after procedure
Normal pressure hydrocephalus
Alzheimer's
Dementia with Lewy bodies
Stroke
Prion disease
Parkinson's disease
Multiple sclerosis
Electrolyte abnormality