Reference values vary based on several factors, including the specific laboratory that supplies them. A patient's CSF test values should be interpreted based on the reference value of the laboratory in which the test was done; the laboratory typically provides these values with the test result. Some representative values are listed in alphabetical order in the following table.
Representative Laboratory Reference Values: Cerebrospinal Fluid (CSF)*
0–5 x 106 lymphocytes/L
40–80 mg/dL (< 40% of simultaneously measured plasma level if that plasma level is abnormal)
2.2–4.4 mmol/L (< 40% of simultaneously measured plasma level is abnormal)
Myelin basic protein
< 1.5 ng/mL
< 1.5 mcg/L