Table 3.

Oral glucose tolerance test methods

1	Maintain usual physical activity and consume an unrestricted diet (greater than 150 g of carbohydrate daily) for at least 3 days before the test.
2	An overnight fast of 10–14 hours should be preceded for fasting plasma glucose measurement.
3	Drink 75 g of glucose in 250–300 mL of water or 150 mL of a commercially available dextrose solution over 5 minutes.
4	Blood samples are collected 2 hours after the test load (The time at which drinking began is considered 0 minute).
5	If appropriate, samples may also be taken in 30, 60, and 90 minutes.