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Glucose Tolerance Test, 1 or 2 hour
MessageMust be scheduled with the Laboratory
Test Code
GTT1/2T
Alias/See Also
GTT
Preferred Specimen
1.0 mL plasma (0.5 mL minimum)
Instructions
- Must be scheduled with the Laboratory
- Schedule the patient for testing in the morning as carbohydrate tolerance deteriorates as the day progresses. The patient should be ambulatory, on an unrestricted diet and fasting at least 10 hours prior to testing.
- The patient should not have had any upper GI series within 72 hours prior to the test as Barium interferes with the absorption of the glucose.
Transport Container
PST (light green top). Gray top and SST also acceptable
Clinical Significance
Glucose Tolerance Test is used to determine if a patient’s blood glucose level is within normal range. Blood glucose testing can help diagnose and monitor diabetes, pre-diabetes, and hypoglycemia (low blood glucose).
