The current WHO diagnostic criteria for IGT are: a fasting plasma glucose of less than 7.0 mmol/L and a 2-hour venous plasma glucose (after ingestion of 75 g oral glucose load) of 7.8 mmol/L or greater, and less than 11.1 mmol/L. (source: NICE)
IGT is a strong risk factor for developing diabetes and cardiovascular disease, and therefore IGT is managed using lifestyle change ± medication.