A patient has a fasting blood glucose level of 126 mg/dl or higher on two separate occasions; or
A patient has a random blood glucose level of 200 mg/dl or greater and has common symptoms of diabetes, such as:
Increased thirst
Frequent urination
Increased hunger
Fatigue
Blurred vision
Weight loss
On occasion, an oral glucose tolerance test may aid in the diagnosis of diabetes or an earlier abnormality that may become diabetes - called impaired glucose tolerance.