Blood glucose levels that are higher than normal but not high enough for a diabetes diagnosis denote pre-diabetes. To determine if a person has pre-diabetes, a person's fasting blood glucose can be measured, or an oral glucose tolerance test—which measures the blood glucose level during fasting and again two hours after the ingestion of a glucose drink—can be performed. If the glucose is above 100 but below 126, impaired fasting glucose (IFG) is diagnosed. If the glucose level is only high after the glucose drink, impaired glucose tolerance (IGT) is diagnosed. Some people will have both IFG and IGT, and this group is at the highest risk for developing type 2 diabetes. People with pre-diabetes can prevent or delay the onset of diabetes by following a diet and exercise plan designed to reduce excess weight. Research also indicates that certain diabetes medications have the same effect.
To learn more, check out this article about pre-diabetes: Ready, Set, Stop!