The hemoglobin is a very important protein of red blood cells, the main function is to bring oxygen throughout the body for the use of tissue and cells. And glycated hemoglobin (HbA1c) is the concentration of glucose attached to the hemoglobin, once the glucose attached to the hemoglobin is not easy to fall off until the red blood cell aging to death.
If the concentration of blood glucose is higher, the higher level of glycated hemoglobin (HbA1c) is. And the general lifetime of red blood cell is 120 days, so the determination of glycated hemoglobin (HbA1c) is able to reflect the state of blood glucose control for past 2-3 months. Therefore, the measurement of glycated hemoglobin (HbA1c) can be only once in 2-3 months.