Normal blood values for a 75-gram oral glucose tolerance test used to check for
type 2 diabetes:
* Fasting: 60 -100 mg/dL
* 1 hour: less than 200 mg/dL
* 2 hours: less than 140 mg/dL. Between 140 - 200 mg/dL is considered impaired glucose tolerance (sometimes called "prediabetes"). This group is at increased risk for developing diabetes. Greater than 200 mg/dL is a sign of diabetes mellitus.
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Normal blood values for a 50-gram oral glucose tolerance test used to screen for
gestational diabetes:
* 1 hour: equal to or less than 140 mg/dL
Normal blood values for a 100-gram oral glucose tolerance test used to screen for
gestational diabetes:
* Fasting: less than 95 mg/dL
* 1 hour: less than 180 mg/dL
* 2 hour: less than 155 mg/dL
* 3 hour: less than 140 mg/dL
Note: mg/dL = milligrams per deciliter
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
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