Glucose tolerance generally refers to glucose tolerance test, some hospitals may need to make an appointment to check, some hospitals may not need to make an appointment to check on the same day, please refer to the rules of your local hospital to see if you need to make an appointment. Glucose tolerance test is a glucose loading test. This test helps to understand the function of the patient’s pancreatic islet B cells and the body’s ability to regulate blood glucose, which helps to diagnose diabetes. The glucose tolerance test should be conducted after 8~10 hours of fasting in the early morning, and the daily carbohydrate intake should be not less than 150g for 3 days before the test, and acute infection, trauma and other factors affecting blood glucose should be excluded. Some hospitals do not require an appointment for the glucose tolerance test; for those who do not maintain a fasting state or some hospitals require an appointment, an appointment is required. Glucose tolerance test should be performed under the supervision of a specialist and the results should be reported by a specialist.