CSF/serum glucose ratio

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| Name = CSF/serum glucose ratio

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| Reference_range = 0.6

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The CSF/serum glucose ratio, also known as CSF/blood 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 there is a bacterial infection in the CSF.

The normal ratio is 0.6.{{cite book |author=Karen Roos |title=Principles of neurologic infectious diseases |publisher=McGraw-Hill, Medical Pub. Division |location=New York |year=2005 |pages=4 |isbn=0-07-140816-9 }}

It is used to distinguish between bacterial and viral meningitis, as it is often lowered in bacterial meningitis and normal in viral meningitis.{{cite journal | author = Tamune H |display-authors=etal | year = 2014 | title = Cerebrospinal fluid/blood glucose ratio as an indicator for bacterial meningitis | journal = Am J Emerg Med | volume = 32 | issue = 3| pages = 263–6 | pmid = 24361137 | doi=10.1016/j.ajem.2013.11.030}}