- normal glucose tolerance (NGT) diagnosis based on fasting glucose value 100mg/dl and 2 hr glucose <140 mg/dl after a standard 75 gm glucose load; impaired fasting glucose (IFG) on fasting glucose value ≥100 and <126 mg/dl and 2 hr glucose <140 mg/dl; impaired glucose tolerance (IGT) based on 2 hr glucose ≥140 and <200 mg/dl and a fasting glucose <126 mg/dl