What is the normal CSF total protein range, with possible higher values in elderly and infants?

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Multiple Choice

What is the normal CSF total protein range, with possible higher values in elderly and infants?

Explanation:
Normal CSF total protein is kept low by the blood–brain barrier, which restricts large proteins from entering CSF. In healthy adults, the typical range is about 15–45 mg/dL. In elderly individuals and in infants, protein levels can be a bit higher due to developmental and barrier-permeability differences, often up to around 70 mg/dL. Values like 60–100 mg/dL or 100–150 mg/dL exceed normal limits, and 0–5 mg/dL is unrealistically low for CSF. So the stated range of 15–45 mg/dL with possible higher values up to ~70 mg/dL in elderly and infants best matches the normal variability.

Normal CSF total protein is kept low by the blood–brain barrier, which restricts large proteins from entering CSF. In healthy adults, the typical range is about 15–45 mg/dL. In elderly individuals and in infants, protein levels can be a bit higher due to developmental and barrier-permeability differences, often up to around 70 mg/dL. Values like 60–100 mg/dL or 100–150 mg/dL exceed normal limits, and 0–5 mg/dL is unrealistically low for CSF. So the stated range of 15–45 mg/dL with possible higher values up to ~70 mg/dL in elderly and infants best matches the normal variability.

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