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Glucose Tolerance Test
Test CodeGTT
CPT Codes
82947; 82950
Includes
Fasting glucose level, glucose 2-hours post tolerance drink
Preferred Specimen
Serum (gold top) tube
Minimum Volume
0.5 mL
Other Acceptable Specimens
Lithium Heparin Plasma (green top) tube
Transport Container
Serum (gold top) tube or Lithium Heparin Plasma (green top) tube
Transport Temperature
Room Temperature or Refrigeration
Specimen Stability
Room Temperature - 24 hours; Refrigeration - 7 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Quantity Not Sufficient, IV contamination
Methodology
Colorimetric
Setup Schedule
Daily upon receipt
Report Available
Upon completion of analysis
Reference Range
Fasting Glucose: 65 - 105 mg/dL
2 hour Glucose: < 140 mg/dL
Clinical Significance
Glucose is a primary cellular energy source. Fasting plasma glucose concentrations and tolerance to a dose of glucose are used to establish the diagnosis of diabetes mellitus and disorders of carbohydrate metabolism. Glucose measurements are used to monitor therapy in diabetics and in patients with dehydration, coma, hypoglycemia, insulinoma, acidosis, and ketoacidosis.