Glucose tolerance generally refers to the oral glucose tolerance test, during the test if the patient vomits after taking sugar it is recommended to redo it. 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. If the oral glucose tolerance test, after taking sugar vomited may enter the body to be absorbed by the reduction of glucose, affecting the accuracy of the test results. If vomiting occurs during the oral glucose tolerance test, it is recommended that you consult your doctor for judgment.