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Test Code LAB82 Glucose, Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Enzymatic (Hexokinase)

Literature Reference:

Package insert: Glucose/HK GLUC3, Roche Corporation, 03/2023.

Specimen Requirements

Note: This test is also available as part of LAB15 Basic Metabolic Panel (BMP), LAB17 Comprehensive Metabolic Panel (CMP), and LAB19 Renal Function Panel. 

 

Patient Preparation:

Eating affects results. Be sure to determine which specimen is required; fasting (>8 hours) or random (after meal).

 

Specimen Type: Plasma

Container/Tube: Grey top (potassium oxalate/sodium fluoride)

Specimen Volume: Full tube

 

Additional Information: Fasting and glucose tolerance/challenge specimens must be drawn in a grey top tube. Random glucose specimens may be drawn in either a grey top tube or a mint-green top tube.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory

Test Classification and CPT Coding

82947

Reference Values

Dependent on time from last meal
Fasting: 

0-3 days: 50-99 mg/dL

> 3 days: 70-99 mg/dL


Random:

0 - 3 days: 50-110 mg/dL

> 3 days: 70-199 mg/dL


Critical result (automatic call-back):

0-3 days: ≤ 44 mg/dL or  ≥ 450 mg/dL

> 3 days: ≤ 54 mg/dL or ≥ 450 mg/dL


Note: Either a fasting plasma glucose >126 mg/dL or a random glucose >200 mg/dL plus symptoms is diagnostic for diabetes when confirmed on another day. Fasting values >100 mg/dL but <126 mg/dL are diagnostic for impaired fasting glucose.

Literature Reference:

Diabetes Care 2016; 39, Supplement 1: 513-522

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only
Alternate Tube:

1 dark green-top (lithium heparin) tube

1 mint green-top (lithium heparin) tube

1 red-top tube

Laboratory Processing Instructions:
Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days. 

Test performed in South County Siteman and Ambulatory Cancer Building Lab.  Centrifuge sample and deliver to the Cobas.  Completed specimens are stored refrigerated for 5 days. 

 

Special Instructions

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

Name LOINC Code
Glucose 2345-7