Glycated hemoglobin is relatively accurate, reflecting the average level of blood glucose in the last 2 to 3 months, and is not affected by factors such as the time of blood sampling, whether or not fasting, or whether or not using hypoglycemic drugs, etc. However, if the subject is also suffering from iron-deficiency anemia, massive blood loss, etc., it will have a certain impact on the results of the measurement. Results may vary slightly from laboratory to laboratory. Glycated hemoglobin reflects the average blood glucose value over the last 2 to 3 months. The higher the blood glucose level, the higher the level of HbA1c. The normal range of glycosylated hemoglobin is 4.0% to 6.0%. Diabetic patients generally need to keep it below 7.0%, and need to set goals for sugar control according to their individual conditions. Glycated hemoglobin is highly accurate and is not affected by factors such as the time of blood draw, whether or not you are fasting, or whether or not you are using hypoglycemic medication. Glycated hemoglobin, when combined with self-monitoring of blood glucose, provides a better picture of blood glucose control. Because glycated hemoglobin measures the protein in red blood cells that binds to glucose, if red blood cell abnormalities such as iron deficiency anemia, massive blood loss, or hemolytic anemia are present, the results of the glycated hemoglobin test will be affected to some degree. Prompt medical attention is recommended for abnormal glycosylated hemoglobin.