If you vomit when doing glucose tolerance, the reliability of the glucose tolerance result will be affected. It is recommended to choose another time to do glucose tolerance test, and you can extend the time of drinking sugar water appropriately. If you still vomit, you can choose to take 100 grams of flour orally to make buns for glucose tolerance test. Glucose tolerance test is an important method to diagnose diabetes and determine the function of pancreatic islets. Glucose tolerance test is to take 75 grams of anhydrous glucose orally on an empty stomach, dissolve it in 250-300 milliliters of water, and drink it in 5-10 minutes. It is possible that the high concentration of sugar stimulates the gastrointestinal tract leading to vomiting, at which point the results will be affected. This kind of vomiting usually improves after rest and does not require special treatment. You can choose another time to re-do the glucose tolerance test, avoid tension and anxiety, do deep breathing, you can extend the time to drink sugar water, can reduce gastrointestinal stimulation. Glucose tolerance test should be standardized under the guidance of the doctor, and vomiting should be told to the doctor in time, under the guidance of the doctor’s diagnosis and treatment.