Estimated average glucose (eAG) is an estimated average of your blood sugar (glucose) levels over a period of 2 to 3 months. It is based on your A1C blood test results.
Knowing your eAG helps you predict your blood sugar levels over a time. It shows how well you are controlling your diabetes.
Glycated hemoglobin or A1C is a blood test that shows the average level of blood sugar over the previous 2 to 3 months. A1C is reported as a percent.
eAG is reported in mg/dL (mmol/L). This is the same measurement used in home blood sugar meters.
eAG relates directly to your A1C results. Because it uses the same units as home meters, eAG makes it easier for people to understand their A1C values. Health care providers now use eAG to talk with their patients about A1C results.
Knowing your eAg can help you:
- Track your blood glucose levels over time
- Confirm self-test readings
- Better manage diabetes by seeing how your choices affect blood sugar
You and your provider can see how well your diabetes care plan is working by looking at your eAG readings.
Understanding Your eAG Readings
The normal value for eAG is between 70 mg/dl and 126 mg/dl (A1C: 4% to 6%). A person with diabetes should aim for an eAG less than 154 mg/dl (A1C < 7%) to lower the risk for diabetes complications.
The results of an eAG test may not match your average of day-to-day blood sugar tests you have been taking at home on your glucose meter. This is because you are likely to check your sugar levels before meals or when your blood sugar levels are low. But it does not show your blood sugar at other times of the day. So, the average of your results on your meter may be different than your eAG.
Your doctor should never tell you what your blood sugar values are based on the eAG because the range of average blood glucose for any individual person is very broad for each A1c level.
There are many medical conditions and medicines that change the relationship between A1c and eAG. Do not use eAG to evaluate your diabetes control if you:
- Have conditions such as kidney disease, sickle cell disease, anemia, or thalassemia
- Are taking certain medicines, such as dapsone, erythropoietin, or iron
American Diabetes Association website. A1C and eAG. www.diabetes.org/living-with-diabetes/treatment-and-care/blood-glucose-control/a1c. Updated September 29, 2014. Accessed August 17, 2018.
American Diabetes Association website. All about blood glucose. professional.diabetes.org/sites/professional.diabetes.org/files/media/All_about_Blood_Glucose.pdf. Accessed August 17, 2018.
American Diabetes Association. 6. Glycemic targets: Standards of Medical Care in Diabetes-2018. Diabetes Care. 2018;41(Suppl 1):S55-S64. PMID: 29222377 www.ncbi.nlm.nih.gov/pubmed/29222377.
Review Date 1/24/2019
Updated by: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.