The blood glucose is usually measured by intravenous plasma glucose, and its standard range is 3.9-6.1mmol/L in the case of fasting.The definition of fasting refers to eight hours without food, for example, after 10 o’clock at night without food and water, and the next morning after 6 o’clock blood draw this kind of is called fasting. If the standard of postprandial blood glucose, generally two hours after the meal as a standard, let the patient eat a two-two steamed buns or eat a flat bowl of rice, and then or drink 75 grams of dextrose powder, and then to two hours time and then draw blood for the second time, the normal range of blood glucose two hours after the meal is less than 11.1 mmol / L. If it is more than 11.1 mmol / L can diagnose diabetes, and then any time to measure diabetes, and then any time to measure diabetes. Diabetes can be diagnosed if it exceeds 11.1mmol/L, and the blood glucose level should not exceed 11.1mmol/L at any one time.