Glucose tolerance is the abbreviation of oral glucose tolerance test, and the process of glucose tolerance is mainly as follows: 1. Fasting blood is drawn from a vein to measure blood glucose, and insulin can be measured at the same time. 2. 75g of glucose is added to 200-300ml of water, or 83.5g if it is glucose powder, after blood is drawn on an empty stomach, and it is drunk within 5 minutes. Start timing from the first sip of sugar, and draw blood to measure intravenous blood glucose 1 hour and 2 hours after taking sugar, and insulin can be measured at the same time.3. In a few cases where the duration of glucose tolerance needs to be extended, the timing can be continued to measure blood glucose for 3 hours.4. Note that the daily carbohydrate is not less than 150g for 3 days before glucose tolerance, and no other food containing calories can be eaten during the glucose tolerance test, and strenuous activities are not recommended, but there is no need to Bed rest, smoking, coffee and other factors affecting blood glucose are prohibited.