There is no definite time for how often the glucose tolerance should be done at intervals, and it varies from person to person. If the patient is pre-diabetic and has not yet reached the diagnostic criteria for diabetes, he or she can monitor blood glucose on a daily basis and follow the doctor’s instructions to review glucose tolerance according to the changes in his or her condition. If diabetes has been diagnosed, regular glucose tolerance is usually not needed. Healthy people with normal blood glucose may not need regular glucose tolerance. Glucose tolerance test is a common test in which the examinee fasts for 8 to 10 hours the night before, and then early the next morning, 75 grams of anhydrous glucose is added to 250 to 300 ml of water and drunk within 5 minutes, and the fasting blood glucose as well as the blood glucose after 0.5 hours, 1 hour, 2 hours, and 3 hours are measured respectively. If glucose tolerance is abnormal, but does not meet the diagnostic criteria for diabetes mellitus, it is recommended to monitor the changes in blood glucose on your own on a daily basis, and follow the doctor’s instructions to review glucose tolerance according to your condition. If diabetes has already been diagnosed, it is usually not necessary to conduct another glucose tolerance test, and treatment can be taken according to the blood glucose level. Healthy people with normal blood glucose do not need to take a glucose tolerance test regularly. Abnormal glucose tolerance is recommended to be treated as soon as possible.