What is the normal CSF glucose value?

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Multiple Choice

What is the normal CSF glucose value?

Explanation:
CSF glucose tracks blood glucose but sits a bit lower because it diffuses into the CSF and is used by brain tissue. The normal value is about two-thirds of plasma glucose. So if blood glucose is around 90 mg/dL, CSF glucose is about 60 mg/dL; if blood glucose is around 120 mg/dL, CSF glucose is around 80 mg/dL. That makes the typical normal CSF glucose range roughly 45–80 mg/dL, which is captured by the option stating 45–80 mg/dL or 2/3 of blood glucose. The other ranges are not consistent with this relationship.

CSF glucose tracks blood glucose but sits a bit lower because it diffuses into the CSF and is used by brain tissue. The normal value is about two-thirds of plasma glucose. So if blood glucose is around 90 mg/dL, CSF glucose is about 60 mg/dL; if blood glucose is around 120 mg/dL, CSF glucose is around 80 mg/dL. That makes the typical normal CSF glucose range roughly 45–80 mg/dL, which is captured by the option stating 45–80 mg/dL or 2/3 of blood glucose. The other ranges are not consistent with this relationship.

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