Definition of Glucose test - CSF:

A CSF glucose test measures the amount of sugar (glucose) in the cerebrospinal fluid (CSF). CSF is a clear fluid that flows in the space surrounding the spinal cord and brain.

See also:

• Glucose test - blood
• Glucose test - urine

How the test is performed:

The health care provider will place a needle into the lower spinal area and take a sample of cerebrospinal fluid. This is called a spinal tap or lumbar puncture. The entire procedure takes about 20 minutes. For detailed information, see the article on lumbar puncture.

The fluid is sent to a lab, where it is examined under a microscope.

How the test will feel:

Under experienced hands there should not be any pain. You may feel pressure when the needle is inserted. Occasionally, some people may feel numbness shooting down the leg. This may be due to irritation of a nerve root.

Following the procedure, you will be asked to remain lying down for a while to prevent headaches associated with spinal taps.

Why the test is performed:

This test may be done to diagnose tumors, infections, inflammation of the central nervous system, delirium, and other neurological and medical conditions.