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.