The CSF/serum glucose ratio is a measurement used to compare CSF glucose and blood sugar.
Because many bacteria metabolize glucose, and because the blood brain barrier minimizes transversal, the ratio can be useful in determining whether or not there is a bacterial infection in the CSF.
The normal ratio is 0.6.
It is used to distinguish between bacterial and viral meningitis.
- ^ Karen Roos (2005). Principles of neurologic infectious diseases. New York: McGraw-Hill, Medical Pub. Division. p. 4. ISBN 0-07-140816-9.