The normal range of hbalc is 4%~6%, and the reference range of different reagents varies somewhat. hbalc, also known as glycosylated hemoglobin, is the product of the combination of hemoglobin in red blood cells and sugars in serum. This test can be used to assist in the diagnosis of diabetes, and can also be used to determine the diabetic patient’s recent blood glucose control, the reference range of the commonly used reagents is 4%~6%. If it is within the normal range, it indicates that the patient’s blood glucose control has been adequate and the patient can continue with the current regimen to lower blood glucose. Glycosylated hemoglobin greater than 6% indicates that the patient’s blood glucose control has been poor for some time and an adjustment to the glucose-lowering regimen is needed. If it is less than 4%, the patient’s glycemic control is too low and he/she is prone to hypoglycemia, which may require an adjustment of the glucose-lowering regimen.