CSF glu = 60. CSF/S alb = 7.5. CSF/S glu = 0.4. The glucose level in CSF is proportional to the blood glucose level and corresponds to 60-70% of the concentration in blood. Therefore, normal CSF glucose levels lie between 2.5 and 4.4 mmol/L (45-80 mg/dL).SF glucose or glycorrhachia is a measurement used to determine the concentration of glucose in cerebrospinal fluid (CSF).