Estimated Average Glucose
Your HbA1c translated into an approximate average blood glucose level.
| Typical reference range | below 116 mg/dL |
| Commonly cited optimal range | below 108 mg/dL |
Ranges vary by laboratory, method, age and sex: always use the range printed on your own report. Why labs differ.
What it measures
eAG is calculated from HbA1c using the ADAG study formula (eAG = 28.7 x A1c - 46.7). It expresses the same information in the units of everyday glucose readings.
Why it matters
It makes HbA1c easier to relate to fingerstick or CGM readings. An HbA1c of 5.7% corresponds to an eAG of about 117 mg/dL.
What a high result can mean
Elevated eAG has the same meaning as elevated HbA1c: sustained high blood glucose from insulin resistance, prediabetes or diabetes, or factors that falsely raise HbA1c.
What a low result can mean
Low values carry the same caveats as low HbA1c, such as rapid red blood cell turnover.
What affects the result
It is a derived number, not a separate measurement, and inherits all HbA1c limitations. Individual averages can differ from eAG by 15-20 mg/dL.
Units and conversion
Usually reported in mg/dL.
- From mmol/L: multiply by 18.016 to get mg/dL
Also called on lab reports
eAG, Est. Average Glucose, Estimated Avg Glucose, eAG (mg/dL)
Related tests: Glucose & Metabolic
This page is educational and does not replace advice from a healthcare professional.