The normal range of glycated hemoglobin in normal people is generally between 4% and 6%. Due to different examination methods and reagents, the reference indexes of each hospital are different and need to be analyzed specifically. Glycated hemoglobin is the product of the non-enzymatic reaction between hemoglobin in red blood cells and glucose in serum. Because of its continuous, slow and irreversible characteristics, glycated hemoglobin can effectively reflect the average blood glucose level in the past 2~3 months. Glycated hemoglobin value is not easily affected by factors such as eating, hypoglycemic drugs, etc., and can relatively accurately reflect the overall blood glucose level over a period of time, which is often used as one of the blood glucose monitoring indexes for diabetic patients in clinic, and can also be differentiated from the blood glucose elevation caused by other factors. If abnormal glycosylated hemoglobin occurs, please consult the hospital in time and make positive diagnosis and treatment to avoid delaying the condition.