Impaired glucose tolerance


People with impaired glucose metabolism are at increased risk for developing frank diabetes. There are two forms of impaired glucose metabolism :

I. Impaired Fasting Glucose A person has impaired fasting glucose (IFG) when fasting plasma glucose is 110 to 125 mg/dL. This level is higher than normal but still less than the level indicating a diagnosis of diabetes.

II. Impaired Glucose Tolerance Impaired glucose tolerance (IGT) means that blood glucose during the oral glucose tolerance test is higher than normal but not high enough for a diagnosis of diabetes. IGT is diagnosed when the glucose level is 140 to 200 mg/dL 2 hours after a person is given 75 grams of glucose dissolved in 300 ml of water.

Implications of IGT

  • People with IGT should be monitored at regular intervals as they can develop frank diabetes with time.
  • With proper weight control, diet intake and exercise a person with IGT may revert to normal.