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HelpTest 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: Interpretive Data
Fasting glucose >/= 126 mg/dl is diagnostic for diabetes.
Fasting is defined as no caloric intake for at least 8 hours.
Fasting glucose between 100 mg/dl to 125 mg/dl is diagnostic
of prediabetes.
In a patient with classic symptoms of hyperglycemia or
hyperglycemic crisis, a random glucose >/= 200 mg/dl is diagnostic
for diabetes.
In the absence of unequivocal hyperglycemia, results should be
confirmed by repeat testing.
Literature Reference:
The classification and Diagnosis of Diabetes
Diabetes Care 2022; 46: S19-S40
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 |