When you have diabetes, you may be asked to get an A1c (hbA1c) test as often as every three months. The purpose of this test is to get an idea of your average glucose levels over the past 2-3 months.In addition to providing an idea of your level of control, these results can be used to tell if changes to your regimen have been beneficial and also give an idea of risks for complications.
The test result can be provided as a percentage or as an eAG result. The term eAG stands for estimated Average Glucose.
The eAG translates the A1c test result into units patients are more familiar with when testing at home.
For example, according to the chart below, an A1c reading of 6% translates into an eAG around 126 mg/dl. In other words, according to units similar to those provided by your home glucometer, an A1c level of 6 means your glucose levels for the past 2-3 months have been around 126.
Below is an A1c to eAG conversion chart. You can find an online calculator at the American Diabetes Association's DiabetesPro site.
A1c to eAG Conversion Chart
|HbA1c or A1c||eAG|
The formula is used is: 28.7 X A1C - 46.7 = eAG
A1C. American Diabetes Association. Accessed: April 20, 2011. http://www.diabetes.org/living-with-diabetes/treatment-and-care/blood-glucose-control/a1c
Nathan MD, David M; Kuenen MD, Judith; Borg MD, Rikke; Zheng PHD, Hui; Schoenfeld PHD, David; Heine MD, Robert J for the A1c-Derived Average Glucose (ADAG) Study Group. "Translating the A1c Assay Into Estimated Average Glucose Values." Diabetes Care Aug 2008 31(8):1473-1478