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Glucose Challenge
Test CodeGCHAL
Alias/See Also
Epic: LAB2288
Preferred Specimen
Specimen Type: Plasma
Collection Container: Grey top (potassium oxalate/sodium fluoride)
Specimen Volume: 3 mL
Patient Preparation
- Cigarette smoking will affect results and should be avoided.
- Fasting is not necessary.
Minimum Volume
0.1 mL
Other Acceptable Specimens
Specimen Type: Plasma
Collection Container: Green top (Lithium heparin)
Specimen Type: Serum
Collection Container: Serum gel, red top
Instructions
- No fasting sample is collected.
- Administer 50 grams oral glucose solution. Ingestion should be completed within five (5) minutes.
- Draw sample one (1) hour after ingestion of oral glucose.
- Centrifuge and separate cells after clot formation and within 4 hours of collection.
Transport Container
Plastic vial
Specimen Stability
Room temperature: 2 days
Refrigerated: 7 days
Frozen: 1 day
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Unlabeled, mislabeled, wrong tube type, QNS, hemolyzed.
Methodology
Hexokinase / G-6-PDH
Setup Schedule
Daily
Report Available
Same day
Reference Range
See laboratory report
Clinical Significance
Blood glucose determinations are commonly used as an aide in the diagnosis and treatment of diabetes. Elevated glucose levels (hyperglycemia) may also occur with pancreatic neoplasm, hyperthyroidism, and adrenal cortical hyperfunction as well as other disorders. Decreased glucose levels (hypoglycemia) may result from excessive insulin therapy or various liver diseases.
Performing Laboratory
Inova Laboratories
2832 Juniper Street
Fairfax, VA 22031
Last Updated: April 25, 2024
Last Review: N. Wolford, April 25, 2024