What can a lumbar puncture test reveal? having warm sensation on right side of body and can be sensitive to touch, stiff neck and back at times.

Spinal Tap: Lumbar puncture, or spinal tap, is a test of the cerebrospinal fluid. CSF is a clear fluid similar to saline in an IV, or eye drops, that surrounds the brain, spinal cord and spinal nerves that contains small amounts of proteins and sugars. The physician measures the pressure in the spine and collects samples of the fluid to test for diseases like meningitis, tumors, or Multiple Sclerosis.