What this marker measures
eAG is provided as a convenience number alongside HbA1c so the value reads in familiar glucose units. It is not a standalone diagnosis marker. Diagnosis usually requires confirmation and clinical context based on HbA1c and other markers, not on eAG.
High or low: what it can mean
High eAG
eAG mirrors HbA1c by definition — a "higher" eAG simply means a higher HbA1c. There is no independent eAG threshold. Interpretation always belongs with the HbA1c result and the rest of the metabolic picture.
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Low eAG
eAG mirrors HbA1c — a "lower" eAG simply means a lower HbA1c. As with HbA1c, very low values may reflect altered red-cell turnover and are reviewed together with HbA1c and clinical context.
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Frequently asked questions
What is eAG?
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eAG is a helper value calculated from HbA1c that translates the HbA1c percentage into the same units used for everyday glucose readings (mg/dL or mmol/L). It is not a stand-alone test and has no independent reference range.
What does eAG measure?
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eAG is provided as a convenience number alongside HbA1c so the value reads in familiar glucose units. It is not a standalone diagnosis marker. Diagnosis usually requires confirmation and clinical context based on HbA1c and other markers, not on eAG.
What does high eAG mean?
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eAG mirrors HbA1c by definition — a "higher" eAG simply means a higher HbA1c. There is no independent eAG threshold. Interpretation always belongs with the HbA1c result and the rest of the metabolic picture.
What does low eAG mean?
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eAG mirrors HbA1c — a "lower" eAG simply means a lower HbA1c. As with HbA1c, very low values may reflect altered red-cell turnover and are reviewed together with HbA1c and clinical context.
Related biomarkers
Editorial note
LabTestly explains lab markers using plain-English educational content. Reference ranges may vary by laboratory and should be interpreted with a clinician.
Educational content · Editorially reviewed for clarity · Last updated
Common sources used for lab-test education
Not medical advice
This page is for general understanding only and does not replace medical advice from your clinician. Reference ranges can vary by laboratory, age, sex, pregnancy status, medications, and clinical context.