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Glucose, CSF

Item Value
Approval req'd? No
Available Stat? Yes
Test code GLC
Test group Glucose
Performed by Parnassus & Mission Bay Chemistry
In House Availability Test available 24 hours per day 7 days per week
Method Parnassus:Oxygen consumption (O2 electrode with glucose oxidase)
Collection Instructions Specimen label must contain the date the sample was collected and the legible name of the person who collected the sample.
Container type CSF tube or sterile collection tube
Amount to Collect 3 mL CSF
Sample type CSF
Preferred volume 0.5 mL CSF
Min. Volume 0.2 mL CSF
Units mg/dL
Normal range 40-70 mg/dl
Critical value < 30 mg/dL
Stability Refrigerated 10 days.
Turn around times STAT 1 hour, Routine 4 hours
Additional information To convert mg/dl to mmol/L (SI units) multiply by 0.0555.

CSF levels are usually > 55% of serum glucose and > 40 mg/dL. As serum glucose rises above 200 mg/dL the CSF/serum ratio falls from about 0.55 to a minimum of 0.31.
CPT coding 82945
LOINC code 2342-4
Last Updated 6/20/2016 2:19:28 PM
Entry Number 424
Lab Procedure Link Click here for Procedure
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