A condition in which blood glucose levels are higher than normal but are not high enough for a diagnosis of diabetes. Igt, also called pre-diabetes, is a level of 140 to 199 mg/dl 2 hours after the start of an oral glucose tolerance test. People with pre-diabetes are at increased risk for developing type 2 diabetes, heart disease, and stroke. Other names for igt that are no longer used are "borderline," "subclinical," "chemical," or "latent" diabetes.