What are the normal values for a GTT?
The GTT that was formerly used to diagnose diabetes is still used, but it is not recommended to be used routinely. The old values were:
• 90 min < 200 mg/dl
• 2 hr < 140 mg/dl
• 3 hr < 125 mg/dl
Currently, the American Diabetes Association recommends the following criteria be used:
• 2-h postload glucose < 140 mg/dl (7.8 mmol/l) = normal glucose tolerance.
• 2-h postload glucose 140–199 mg/dl (7.8–11.1 mmol/l) = IGT (impaired glucose tolerance).
• 2-h postload glucose 200 mg/dl (11.1 mmol/l) = provisional diagnosis of diabetes (the diagnosis must be confirmed, as described below).
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