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Test Code GLUC or LAB82 Glucose, Serum or Plasma

Important Note

An 8-12 hour fast is not required but is recommended. Indicate the patient's fasting status on the order request form.

Specimen Requirements

Container Type:

Optimal: Gold or Mint*

*For STAT requests

Acceptable: Red or Green
Optimal Collection Volume: 

4.5mL; full tube
Minimum Volume:
  • Adults: 1 mL whole blood
  • Neonates: 1 microtainer (400-600 uL)
Collection Instructions:

Gently invert the sample 5-6 times after collection.
Specimen Transport:

Refrigerate
Processing Instructions: 

1. If serum, allow the specimen to clot for 30 minutes.

2. Centrifuge specimen within 2 hours of collection.

3. After centrifugation, specimen tubes without a gel barrier should have the serum or plasma aliquoted to a false bottom container.

4. Keep the serum or plasma refrigerated until testing can be performed.

Specimen Stability

Specimen Type Temperature Time
Serum* Refrigerated 3 days
Room Temperature 8 hours

*Note: Heparinized plasma in gel separator tubes is less stable than serum and is only suitable for add-on testing up to 2 days following sample collection.

Specimen Rejection Criteria

Hemolysis Mild OK; Moderate OK; Gross Reject
Lipemia Mild OK; Moderate OK; Gross Reject
Icterus Mild OK; Moderate OK; Gross Reject
Other Quantity not sufficient

Useful For

Glucose measurements are used in the diagnosis and monitoring of carbohydrate metabolism disorders including diabetes mellitus, neonatal hypoglycemia, idiopathic hypoglycemia, and pancreatic islet cell carcinoma.

Methodology

Roche Cobas - Enzymatic with hexokinase

Day(s) Performed

24/7

Expected TAT

Same day

Performing Laboratory

Bronson Laboratory, Chemistry - Kalamazoo, Battle Creek, Paw Paw, South Haven

Sample Retention Time

7 days

CPT Code

82947

LOINC Code

2345-7

Reference Ranges (Fasting)

Age

Reference Range and Reporting Units
Newborn to 3 months 41-115 mg/dL
3-6 months 50-115 mg/dL
Adults (> 6 months) Normal: 70-99 mg/dL
Impairing fasting: 100-125 mg/dL
Abnormal: > 125 mg/dL

 

Critical Values

Age Low High
0-3 months < 40 mg/dL > 200 mg/dL
3-6 months < 40 mg/dL > 450 mg/dL
Adults - Non Outpatient (> 6 months) < 55 mg/dL > 450 mg/dL
Adults - Outpatient (> 6 months) < 40 mg/dL > 450 mg/dL

 

Critical value updated for out patient adults 11/5/24 as described here: