![]() ![]() This equation is based on data from a study of over 500 subjects (268 T1Ds, 159 T2Ds, and 80 non-diabetics) at 10 international centers around the world. Most (if not all) average blood sugar to A1C conversion tables and calculators use the below equation to estimate average blood glucose from A1C:Įstimated Average BG (mg/dL) = 28.7 X A1C (%) - 46.7 The correlation between A1C and estimated average blood glucose is not perfect. the three months prior to the date of your A1C test).Ģ. And make sure you check at various times throughout the day, including one to two hours after eating. And be sure you are comparing the same timeframes measured in your glucose meter reports to the timeframe your A1C is measuring (i.e. ![]() If you want your meter average to better reflect your A1C values, check more often. So, for many people, a blood glucose meter average doesn't accurately reflect average blood sugar over a full 24 hours. A1C, on the other hand, does. W e also tend to test more often before eating (when blood sugar levels are typically lower), and less often after meals (when blood sugar levels are typically higher). We generally check much more during the day than at night, and nighttime glucose values may be very different from daytime values. If you are not on a CGM, it's tough to get a full picture of your average blood sugar throughout the day. The Ultimate Guide to A1C Why Doesn't My A1C Match My Average Blood Sugar?ġ. A glucose meter average does not usually reflect the average over a full 24 hours A1C measures the percent of red blood cells with glucose attached to the hemoglobin.Hemoglobin is the same protein that carries oxygen in your bloodstream.As glucose enters your blood, it attaches to a protein in your red blood cells called "hemoglobin.".Why Use A1C?įirst, let's briefly go over why A1C is used to approximate average blood sugar over two to three months: Here are some reasons why someone's actual A1C may be higher or lower than expected or why you might have a normal A1C, but high fasting glucose. What is the deal? It turns out, the relationship between average blood sugar and A1C isn't as clear as most of us think. Then, you get your blood work results and learn that your actual A1C is not even close to what you were estimating. You take your average blood sugar and convert it to A1C using a table, calculator, or equation you find online. You test your meter for accuracy and everything looks good. Individual variations in hemoglobin and differences in red blood cell turnover can impact A1C results.One way to increase how closely your average blood sugar aligns with your A1C is to check your blood sugar levels more regularly.For example, you might have a normal A1C, but high fasting glucose. The relationship between average blood sugar and A1C isn’t as clear as many of us think. ![]()
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