BACK TOTOP Browse A-ZSearchBrowse A-ZABCDEFGHIJKLMNOPQRSTUVWXYZ0-9 E-mail FormEmail ResultsName:Email address:Recipients Name:Recipients address:Message: Print-FriendlyBookmarksbookmarks-menuCSF glucose testGlucose test - CSF; Cerebrospinal fluid glucose testA 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. How the Test is Performed A sample of CSF is needed. A lumbar puncture, also called a spinal tap, is the most common way to collect this sample.Lumbar punctureCerebrospinal fluid (CSF) collection is a test to look at the fluid that surrounds the brain and spinal cord. CSF acts as a cushion, protecting the b...ImageRead Article Now Book Mark Article Other methods for collecting CSF are rarely used, but may be recommended in some cases. They include:Cisternal puncture Ventricular puncture Removal of CSF from a tube that is already in the CSF, such as a shunt or ventricular drain The sample is sent to a laboratory for testing. Why the Test is Performed This test may be done to diagnose:Tumors Infections Inflammation of the central nervous system Delirium Other neurological and medical conditions Normal Results The glucose level in the CSF should be 50 to 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 health care provider about the meaning of your specific test results. Results can also be affected by your serum glucose level, especially if levels are extreme.The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens. What Abnormal Results Mean Abnormal results include higher and lower glucose levels. Abnormal results may be due to:Infection (bacterial or fungus) Inflammation of the central nervous system Tumor Open ReferencesReferencesDeluca GC, Griggs RC. Approach to the patient with neurologic disease. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 368.Euerle BD. Spinal puncture and cerebrospinal fluid examination. In: Roberts JR, Custalow CB, Thomsen TW, eds. Roberts and Hedges' Clinical Procedures in Emergency Medicine and Acute Care. 7th ed. Philadelphia, PA: Elsevier; 2019:chap 60.Rosenberg GA. Brain edema and disorders of cerebrospinal fluid circulation. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 88.AllVideoImagesTogLumbar puncture (spinal tap) - illustration A lumbar puncture, or spinal tap, is a procedure to collect cerebrospinal fluid to check for the presence of disease or injury. A spinal needle is inserted, usually between the third and fourth lumbar vertebrae in the lower spine. Once the needle is properly positioned in the subarachnoid space (the space between the spinal cord and its covering, the meninges), pressures can be measured and fluid can be collected for testing.Lumbar puncture (spinal tap)illustrationLumbar puncture (spinal tap) - illustration A lumbar puncture, or spinal tap, is a procedure to collect cerebrospinal fluid to check for the presence of disease or injury. A spinal needle is inserted, usually between the third and fourth lumbar vertebrae in the lower spine. Once the needle is properly positioned in the subarachnoid space (the space between the spinal cord and its covering, the meninges), pressures can be measured and fluid can be collected for testing.Lumbar puncture (spinal tap)illustration Tests for CSF glucose test CSF glucose testCerebrospinal fluid (CSF) collectionCSF analysisRelated Information Review Date: 5/4/2021 Reviewed By: Joseph V. Campellone, MD, Department of Neurology, Cooper Medical School at Rowan University, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. 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. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- © 1997- All rights reserved. A.D.A.M. content is best viewed in IE9 or above, Firefox and Google Chrome browser.Content is best viewed in IE9 or above, Firefox and Google Chrome browser.