Glycated hemoglobin is the average level of blood glucose control in the past 2-3 months, while fingertip glucose only reflects the blood glucose level at the time of measuring sugar, and the relationship between fingertip glucose and glycated hemoglobin is the relationship between point and surface. The relationship between fingertip glucose and glycated hemoglobin is the relationship between point and surface. A glycated hemoglobin higher than the normal level of 6.2% indicates that the average blood glucose level in the past 2-3 months is higher. Some patients may occasionally measure fingertip blood glucose is normal, but it only reflects the blood glucose level at that time, and the blood glucose when not monitored may be high. Therefore, when a patient has high glycosylated hemoglobin, a standard glucose tolerance test and insulin release test should be performed to assess whether there is any problem with blood glucose level and insulin secretion. If there is a problem, the patient should be treated with appropriate medication as soon as possible. It may also be possible to bring glycated hemoglobin down to a normal range.