Like the familiar A1C test, the estimated average glucose, or eAG, is derived from glucose values taken over the course of three months. The eAG, however, is not reported as a percentage but in the same values seen via daily self-monitoring – mg/dl or mmol/l. The formula for determining average glucose is 28.7xA1C-46.7 = eAG.
The following chart translates A1C percentages into eAG:
|If your A1C is this:||eAG (Estimated Average Glucose) is this:|
The eAG term was introduced to help stem confusion after a worldwide standardization of A1C analyses was set. The values are 1.5 to 2 percentages points lower than the current standard. In addition, the values were reported in millimoles per mole (mmol/l), whereas A1C results were always reported as percentages.
An international study was then conducted to look at the relationship between HbA1c and average glucose. The A1C-Derived Average Glucose Study revealed a close relationship between HbA1C and AG (average glucose). This relationship is the eAG, which applies to patients with both type 1 and type 2 diabetes. This terminology focuses on a single set of values for both daily glucose checks and long-term control.
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