Diabetes Impaired glucose tolerance (IGT) Impaired fasting glucose (IFG)
Fasting ≥7 mmol/l <7 mmol/l 6.1-6.9 mmol/l
Plasma (126 mg/dl) (126 mg/dl) (110-125 mg/dl)
Glucose      
2-h OGTT* 11.1 mmol/l 7.8-11.1 mmol/l <7.8 mmol/l
  (200 mg/dl) (140-200 mg/dl) (140 mg/dl)
*2-h OGTT: plasma glucose level at 2 hours after oral ingestion of 75 g glucose
Table 1: Plasma glucose level in the diagnosis of diabetes.