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Test Code LAB4101 GLUCOSE, CSF

Important Note

Traditionally ran off CSF tube #2. Provider must specify tube number to be anaylzed. Sample must be walked to the laboratory. Do not use tube system.

Specimen Type

Sterile CSF Collection Tube

Specimen Volume

1 mL

Minimum Volume

0.2 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Room Temperature: 5 hours

Refrigerated: 3 days
Frozen: 1 month (applies only to CSF "Hold" tube)

Specimen Processing

Separate fluid from cells immediately and transfer to a standard aliquot tube.

Method

Colorimetric

Reference Ranges

Glucose, CSF

0 - 18 Years: 40 - 80 mg/dL

Adult: 40 - 70 mg/dL

Adult Critical: <39 or >400 mg/dL

Test Components

Glucose, CSF, mg/dL

CPT Codes

82945

Test Limitations

Process immediately to avoid falsely low results