How are glycated hemoglobin (HbA1c) and estimated average glucose (eAG) related?

HbA1c (glycated hemoglobin) is used to evaluate the blood glucose of diabetes patients across the preceding 2-3 months. Results are shown as a percentage which can be confusing for those more familiar with mg/dL or mmol/L glucose units. The American Diabetes Association, the European Association for the Study of Diabetes, and the International Diabetes Federation worked together to develop a global standard with which to interpret the relationship between HbA1c and estimated average glucose (eAG). The formula is as follows:

(28.7 x HbA1c) - 46.7 = eAG

The scale below can provide you with the average blood glucose value (eAG) corresponding to HbA1c. Using this, you can understand clearly how blood gluocse relates to HbA1c.
HbA1c VS eAG

Source: American Diabetes Association

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