Glycated hemoglobin of 5.8% corresponds to an average blood glucose level of approximately 6.7 mmol/L over the past 2 to 3 months, which is an estimated value and cannot be taken as a current blood glucose value. Glycated hemoglobin is used to assess the patient’s average blood glucose level over the past 2 to 3 months, and should not be viewed as a value alone, but rather as a reflection of the average blood glucose value over a period of time, which does not reflect the magnitude of fluctuations in the patient’s blood glucose level, whether or not there is a response to hypoglycemia, and so on. It cannot replace daily blood glucose monitoring, including fasting blood glucose, 2-hour postprandial blood glucose and so on. Glycated hemoglobin can be used to evaluate long-term blood glucose control, and is also an important basis for guiding clinical adjustment of the treatment plan. Diabetic patients need to review regularly and adjust the glycemic control program under the guidance of physicians.