Definition
What eAG measures
Estimated average glucose converts the HbA1c percentage into the same mg/dL units a glucose meter shows. It is calculated from HbA1c, not separately measured, using a standard published formula.
Illustrative sample band · Synthetic
111mg/dL
64Sample target 90–108 mg/dL118
Why it matters
How clinicians usually read it
It makes the three-month average concrete. An A1c of 5.5% is abstract; an estimated average near 111 mg/dL is a number you can compare with meals and meters.
When it reads low
A lower value can mean
A lower eAG mirrors a lower HbA1c and means less average glucose exposure. Anything that skews HbA1c — such as unusual red-cell lifespan — skews eAG the same way.
When it reads high
A higher value can mean
A higher eAG mirrors a higher HbA1c and means more time spent with elevated glucose. It inherits every HbA1c caveat because it is derived from it.
Questions for a clinician
Bring the number into a real conversation
01
How does this estimated average compare with any meter or CGM data I have?
02
Is there a red-cell reason my HbA1c and eAG might be misleading?
03
What eAG movement would you consider meaningful by the next draw?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for eAG.