Glucose tolerance test is very necessary for people with high risk of diabetes. What kind of people are at high risk? Generally, they are obese, overweight, have had abnormal blood sugar test records in the past, or have a family genetic history and a history of gestational diabetes. These people should have a glucose tolerance test.

Because the general routine physical examination is mainly to detect fasting blood glucose, and there is a class of diabetic patients whose fasting blood glucose is normal, mainly with high postprandial blood glucose. If these patients only test the routine fasting blood glucose without glucose tolerance test, they will be easily missed.