Fasting is usually not required for testing Glycated Hemoglobin alone. Fasting is required for testing Glycated Hemoglobin in combination with fasting blood glucose and pancreatic function, and it is recommended that you follow your doctor’s instructions on how to perform the test. Glycated hemoglobin is a product of the combination of sugars in the blood and hemoglobin in the red blood cells of the blood. The clinical significance is that it reflects the average level of blood glucose over the last 2-3 months, therefore glycated hemoglobin is usually not affected by eating. Most of the time when blood is drawn to test glycated hemoglobin, usually for diabetic monitoring and review, then it will be combined with fasting blood glucose and pancreatic function, in this case fasting. Glycated hemoglobin abnormalities found in a timely manner to the hospital, a clear diagnosis, standardized treatment under the guidance of the doctor.