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The University of Chicago Medicine Laboratories

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Specimen Collection and Handling

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Mayo Clinic Laboratories

Test Code SFGL CSF Glucose

Specimen and Container/Tube

Specimen Type: Cerebrospinal fluid

Preferred Specimen:CSF tube 

Other Acceptable specimens: Sterile Plastic Container, Sterile Clean Glass Container

Specimen Stability

Storage Temperature

Stability

Room temperature

Assay immediately 

Refrigerated

4 hours

Frozen

 4 hours

Collection Instructions

  • Collect specimen per standard laboratory collection procedures. 
  • No preservatives or additives.

 

Specimen Handling and Transport Instructions

UCMC Onsite Instructions: 

  • Cerebrospinal fluid specimen obtained by clinical procedures.
  • Cerebrospinal fluid must be sent to Laboratory Service Center immediately for analysis
  • Transport refrigerated (2 - 8ºC).

UCMC Offsite and UC MedLab Outreach Instructions: 

  • Cerebrospinal fluid specimen obtained by clinical procedures.
  • Aliquot specimen into transport tube and freeze.
  • Transport frozen on ice to laboratory.

 

Rejection Criteria

  • Common specimen rejected situations include: incorrect specimen type, insufficient volume, missing or incomplete specimen identifiers, incorrect specimen transport, or specimens outside stability limits.
  • Specimens that are collected with preservatives or additives.

Reference Values

 

Test

Age

Sex

Reference Range

Glucose, CSF

All

All

50 - 70 mg/dL 

Critical Values

Not applicable 

Turnaround Time

Turnaround times are relative to the time the specimen is received in the test laboratory. 

STAT Turnaround Time: 1 hour 

Routine Turnaround Time: 4 hours

Testing Schedule:  24/7

Clinical Indications

Glucose measured in cerebrospinal fluid is used for evaluation of meningitis, neoplastic involvement of meninges and other neurological disorders.

Test Components

Glucose, CSF 

Methodology

Spectrophotometric, Kinetic Endpoint (Roche Diagnostics)

CPT Codes

82945

LOINC Codes

2342-4

Synonyms/Keyword Search

N/A

Additional Information

  • Cerebrospinal fluid may be contaminated with bacteria and often contains other cellular constituents that can decrease glucose in vitro. CSF samples for glucose should be analzyed immediately to prevent contamination with bacteria.

Last Review Date

4/10/2025

Volume

Preferred Volume: 0.5 mL

Minimum Volume: 0.2 mL