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 This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.
 CSF glucose testDefinitionA 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: Alternative NamesGlucose test - CSF; Cerebrospinal fluid glucose test How the Test is PerformedA sample of CSF is needed. A lumbar puncture, also called a spinal tap, is the most common way to collect this sample. For information on this procedure, see the article on lumbar puncture. Other methods for collecting CSF are rarely used, but may be recommended in some cases. They include:
After the sample is taken, it is sent to a laboratory for evaluatoin. How to Prepare for the TestSee: Lumbar puncture How the Test Will FeelSee: Lumbar puncture Why the Test is PerformedThis test may be done to diagnose tumors, infections, inflammation of the central nervous system, delirium, and other neurological and medical conditions. Normal ResultsThe glucose level in the CSF should be 50 - 80 mg/100 mL (or greater than 2/3 of the blood sugar level). Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results. What Abnormal Results MeanAbnormal results include increased and decreased glucose levels. Abnormal results may be due to:
RisksSee: Lumbar puncture ReferencesGriggs RC, Jozefowicz RF, Aminoff MJ. Approach to the patient with neurologic disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier. 2007: chap 418.
Review Date:
6/24/2009 Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Daniel B. Hoch, PhD, MD, Assistant Professor of Neurology, Harvard Medical School, Department of Neurology, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997-
A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited. 
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