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CSF Tests: Normal Values

by Frank H. Wians, Jr., PhD

Normal Laboratory Values: CSF


Conventional Units

SI Units

Cell count

0–5 cells/μL

0–0.5 x 10 6 cells/L

Differential (see Table: Cerebrospinal Fluid Abnormalities in Various Disorders [168–1])


40–80 mg/dL (< 40% of simultaneously measured plasma level if that plasma level is abnormal)

2.5–4.4 mmol/L (< 40% of simultaneously measured plasma level is abnormal)

Myelin basic protein

< 1.5 ng/mL

Protein, total

15–60 mg/dL

150–600 mg/L

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