Hemoglobin is part of a red blood cell. Glucose binds with hemoglobin creating glycated hemoglobin. If you have poor control of your diabetes and you blood sugar is high, you will have a higher amount of glycated hemoglobin. The reason it takes 2-3 months to see a "true" reduction of this number is that a red blood cell lives approximately 3 months. For instance, two months ago my A1C was 12.6 (horrible I know). Six weeks later it was down to 10.1. Now my control was much better...but it isnt really a "true reflection" of my progress because some of those older red blood cells are still alive and showing up as high. A true reflection will show up 3 months after that first one, because all the old red blood cells will be gone, so previous damage wont still be showing up. Make sense?
Cheers
Pam