Glucose tolerance diagnostic test
To prepare for the glucose tolerance diagnostic test:
Eat a balanced diet that contains at least 150 grams (g) of carbohydrate per day for 3 days before the test. Fruits, breads, cereals, grains, rice, crackers, and starchy vegetables such as potatoes, beans, and corn are good sources of carbohydrate.
Do not eat, drink, smoke, or exercise strenuously for at least 8 hours before your first blood sample is taken.
Tell your doctor about all prescription and nonprescription medicines you are taking. You may be instructed to stop taking certain medicines before the test.