A1C is reported in percentage. The blood glucose monitor tells a result in mg/dl or mmol/l, this makes the two measurements hardly comparable.
Health care providers can now report A1C results to patients using the same units (mg/dl or mmol/l) that patients see routinely in blood glucose measurements. The new measurement is estimated average glucose, or eAG.
The relationship between A1C and eAG is described by the formula 28.7 X A1C – 46.7 = eAG.
Please note that eAG doesn’t equal to fasting blood glucose or any before-meal or after-meal blood glucose level.
The eAG represents an average of your glucose levels 24 hours a day and over a much longer period of time. Even if you test your blood 10 times a day or more, you are only getting a reading of what your glucose is at that moment. In fact when you calculate the average of your 10 readings, this average from your glucose meter is likely to be lower than your eAG.
Some asked about the conversion between fasting blood sugar level and A1C, there’s no such conversion given the above-mentioned.