Glucose tolerance generally refers to the oral glucose tolerance test, review is generally required to drink sugar water again, the specific circumstances should consult the doctor. Oral glucose tolerance test is a common test, the examiner the night before fasting for 8 to 10 hours, the next morning will be 75 grams of glucose added to 250 to 300 ml of water, within 5 minutes to drink, respectively, to determine the fasting blood glucose and blood glucose after 0.5 hours, 1 hour, 2 hours, 3 hours. Stress should be avoided before the test, and no smoking, eating, or strenuous exercise should be allowed during the test. Oral glucose tolerance test review is usually required to drink another sugar water. Patients who need a glucose tolerance test review should actively cooperate with the specific process of the test.