Estimated average glucose (mg/dL)
What it measures, and what changes the number.
Estimated average glucose, or eAG, is not measured directly. It is calculated from the HbA1c result using a published formula and expresses the same information in the units used for everyday glucose readings, here milligrams per decilitre. It reflects average blood glucose over the previous few months.
Because it is derived from HbA1c, it always appears with an HbA1c result and is often compared with fasting glucose or fructosamine. The mmol/L version carries identical information in different units.
No fasting is needed, since HbA1c does not depend on the most recent meal. Anything that changes red blood cell lifespan or interferes with the HbA1c assay, such as certain haemoglobin variants, carries through into the eAG figure. Labs may print it as eAG (mg/dL).
Often read alongside: HbA1c (NGSP), HbA1c (IFCC), Glucose, Fructosamine, Estimated average glucose (mmol/L)