Glucose tolerance is usually measured by eating 100g steamed buns, the purpose is to test the body’s ability to process glucose, as an important method of diagnosing diabetes mellitus. Glucose tolerance eating steamed buns mainly detects whether the patient’s ability to absorb glucose is normal, and determines whether there is any abnormality in the function of pancreatic islets. After a normal person eats a steamed bun meal, the blood glucose will rise gradually in a short period of time, and usually return to the normal value after 2 hours. The test method of eating steamed buns test is to fast for 8-10 hours before the test, you can drink some plain water appropriately, take fasting blood in the morning without food and medicine, and then eat 100g of steamed buns within 10 minutes. After eating the buns every 30 minutes, 60 minutes, 120 minutes, 180 minutes to draw blood for insulin or C-peptide, according to the results to determine the patient’s pancreatic function. Normal diet and normal rest must be taken before the test to avoid endocrine disruption affecting the results. Patients should go to regular hospitals for glucose tolerance test, do not test on your own to avoid affecting your condition.