If a fasting plasma glucose level is 100 mg/dL, what is the expected fasting CSF glucose level?

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Multiple Choice

If a fasting plasma glucose level is 100 mg/dL, what is the expected fasting CSF glucose level?

Explanation:
CSF glucose is normally about two-thirds of the plasma glucose level because glucose diffuses into the CSF and is consumed by brain tissue, so the CSF concentration sits below plasma. With a fasting plasma glucose of 100 mg/dL, the expected fasting CSF glucose is around 65 mg/dL (roughly 60–70 mg/dL). The other numbers are too high or too low compared with the typical CSF/plasma ratio.

CSF glucose is normally about two-thirds of the plasma glucose level because glucose diffuses into the CSF and is consumed by brain tissue, so the CSF concentration sits below plasma. With a fasting plasma glucose of 100 mg/dL, the expected fasting CSF glucose is around 65 mg/dL (roughly 60–70 mg/dL). The other numbers are too high or too low compared with the typical CSF/plasma ratio.

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