Glucose tolerance generally refers to the oral glucose tolerance test, oral glucose tolerance test before the need to draw blood for fasting blood glucose, the normal range is generally 3.9~6.1mmol/L. The patient should fast for 8~10 hours before the test, that is, the night before after dinner, no more food, no more water after sleeping, normal sleep. Fasting blood glucose requires patients to fast for 8 to 10 hours before the test, that is, no more food after dinner the night before, no more water after bedtime, sleep normally, and then fast the next morning at 7 to 9 o’clock for the test, the determination of fasting blood glucose is one of the commonly used indicators of diabetes mellitus. Fasting blood glucose is one of the common indicators of diabetes. After taking fasting blood glucose, you need to take a certain amount of glucose orally, and then the blood glucose test will be conducted at 0.5 hours, 1 hour, 2 hours, and 3 hours after taking the glucose, respectively. If there is an abnormal blood glucose value, you need to go to the hospital.