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Glucose Tolerance Test 3 Hour
MessageOn Site Testing
Test Code
GTT3H (cs)
Preferred Specimen
Green
Minimum Volume
4.0 mL
Other Acceptable Specimens
None
Setup Schedule
Test availabiltiy and turn around time- 4 Hrs
Reference Range
Reference ranges (normal ranges) are available on all patient reports or through contacting the hospital laboratory.
Clinical Significance
When a standard dose of glucose is given orally, absorption occurs rapidly and the blood glucose concentration
increases. This stimulates the pancreas to produce insulin, then after 30 – 60 minutes, the blood glucose level begins to
decrease. This test measures whether glucose levels indicate normal, impaired glucose tolerance or is diagnostic of
diabetes. The postprandial (after meal) glucose is used to establish the diagnosis of diabetes mellitus.
increases. This stimulates the pancreas to produce insulin, then after 30 – 60 minutes, the blood glucose level begins to
decrease. This test measures whether glucose levels indicate normal, impaired glucose tolerance or is diagnostic of
diabetes. The postprandial (after meal) glucose is used to establish the diagnosis of diabetes mellitus.
