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Glucose Tolerance, 2 Hour
MessagePerforming Lab: Central Lab, Hudson, Lakeview, Regions, Sartell, Westfields
Test Code
EP0152
Alias/See Also
Sunquest: GTT2
CPT Codes
82951
Preferred Specimen
0.2 mL Lithium Heparin Plasma (light green-top) tube
Minimum Volume
0.1 mL
Other Acceptable Specimens
Serum separator (gold-top), Lithium Heparin (light green-top) on ICE, Red, Red/Gray
Instructions
Glucose Tolerance testing involves administration of a glucose solution. Contact performing laboratory for instructions on administration, collection and test performance
Transport Temperature
Refrigerated
Specimen Stability
Room Temperature: 24 hours
Refrigerated: 7 days
Frozen: 1 year
Refrigerated: 7 days
Frozen: 1 year
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples not removed from cellular material within 30 minutes, hemolysis
Methodology
Colorimetric
Setup Schedule
Hospital: Daily
Clinics: Monday - Friday
Clinics: Monday - Friday
Report Available
Same day
Reference Range
Fasting (0-3 Days Old): 40 - 100 mg/dL
Fasting (>3 Days Old): 70 - 100 mg/dL
1 hour: 70 - 200 mg/dL
2 hour: 70 - 140 mg/dL
Critical Low: <= 50 mg/dL
Critical High: >= 450 mg/dL
Fasting (>3 Days Old): 70 - 100 mg/dL
1 hour: 70 - 200 mg/dL
2 hour: 70 - 140 mg/dL
Critical Low: <= 50 mg/dL
Critical High: >= 450 mg/dL
Clinical Significance
The glucose tolerance test measure the body’s response to sugar (glucose) and can be used to screen for type 2 diabetes, often before the fasting blood sugar becomes abnormal. The fasting blood glucose is measured before consumption of a specified dose of a glucose solution is consumed. Periodic blood glucose measurements are performed to determine whether normal metabolism of glucose occurs.
