Glycated hemoglobin generally reflects the average level of blood glucose in the past nearly 2~3 months, and the normal reference value is 4%~6%. Due to different examination methods and reagents, the reference indexes are different in each hospital and need to be analyzed specifically. Glycated hemoglobin measurement is generally used to evaluate the blood sugar control of diabetic patients. Glycated hemoglobin in diabetic patients is generally required to be controlled below 7%. If the test result is higher than the control target, it suggests that blood sugar control has been poor in the last 2~3 months. If the examination finds that the glycated hemoglobin is higher than the normal value range, it is necessary to improve the fasting blood glucose, 2-hour postprandial blood glucose and other tests under the guidance of the doctor, to clarify the condition, and to carry out targeted treatment or therapy.