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IGT - Pre-Diabetes

Diagnosis & Tests

How is the condition diagnosed?

There are two different tests that doctors use to screen for pre-diabetes. Either one is acceptable.

Fasting plasma glucose test, also called FPG. With this test, a person's blood glucose level is measured following a fast, which means no food or drink has been taken in for at least 8 hours. If the blood glucose level is between 110 and 125 mg/dL, the person has pre-diabetes. Levels higher than that indicate type 2 diabetes.

Oral glucose tolerance test, also called OGTT. With this test, a person's blood glucose level is measured after a fast and 2 hours after drinking a special glucose drink. If the 2-hour blood glucose level is 140 to 199 mg/dL, the person has pre-diabetes. Levels at 200 mg/dL or higher indicate type 2 diabetes.

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