If a patient is diagnosed with abnormal glucose tolerance and has not yet reached the diagnostic criteria for diabetes, the patient should review the glucose tolerance test once every six months to observe the changes in fasting blood glucose and the level of blood glucose 2 hours after drinking sugar water, so that abnormalities in blood glucose levels can be detected as early as possible and treatment can be carried out as early as possible. If the patient has already been diagnosed with diabetes, in principle, it is not necessary to conduct the glucose tolerance test again. It is recommended that the patient should review the fasting blood glucose and the 2-hour post-meal blood glucose during the consultation, and also check the fasting or 2-hour post-meal C-peptide level, so that the physician can understand the patient’s current blood glucose control level and pancreatic function, and make appropriate adjustments to the treatment plan.