Glycated hemoglobin is the product of a non-enzymatic reaction between hemoglobin and glucose in the blood, and its relationship with blood glucose is closer. Glycated hemoglobin is an important indicator for monitoring diabetes and is not affected by factors such as blood collection time, fasting status, and insulin use. If a patient’s fasting blood glucose or postprandial blood glucose is not well controlled, glycated hemoglobin will not meet the standard, and if a patient’s fasting blood glucose level increases, the glycated hemoglobin level will also increase accordingly.

Glycated hemoglobin generally reflects the average blood glucose level of patients over 8-12 weeks and provides a useful reference for evaluating the patient’s condition and formulating a treatment plan. However, glycated hemoglobin cannot completely replace fasting blood glucose tests because glycated hemoglobin may also be affected by hemoglobin concentration, for example, anemia patients may have a decrease in glycated hemoglobin, which does not reflect the actual blood glucose level. Therefore, glycated hemoglobin, fasting blood glucose, and postprandial blood glucose are all very important indicators for monitoring blood glucose levels.