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Test Code CSF Glu CSF, Glucose

Patient Preparation

No special patient preparation required

Special Collection Instructions

Transport to lab as soon as possible

Collection Method

Lumbar puncture or CSF shunt

Minimum Volume

  • Adults: 0.5 ml
  • Pediatric: 0.4 ml

Container

Sterile CSF Tube

Preferred Specimen

Sterile CSF Tube

Acceptable Specimens

  • Sterile CSF Tube
  • Sterile Urine Cup

Reference or Target Ranges

40 – 70 mg/dL

Reportable Units

mg/dL

Critical Value

<40 mg/dL

Reasons for Rejection



<!-- Rejection-->
Hemolysis Threshold
 1000 mg/dL
Icterus Threshold
 60 mg/dL
Lipemia Threshold
 1000 mg/dL
Other
 QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability



<!-- Stability -->
Ambient
 ASAP
Refrigerated (4°C to 8°C)
 24 hours
Frozen(-40°C to 0°C)
 N/A

Performance Information



<!-- Performance information -->
Days and Time Performed
 24/7
Expected Turn Around Time
 Stat: 1 hour
Routine: 4 hours
Stat Availability
 Yes
Performing Bench
 UH Chemistry, WCH Chemistry
Methodology/Method Description
 Roche Cobas – UV enzymatic method

Additional Information/Important Notes

CSF Glucose should be approximately 60% of the plasma values and must always be compared with concurrently measured plasma values for adequate clinical interpretation.

CPT Codes

82945