there could be a few things going on. first if you don't test your blood sugar regularly you don't know for sure that they haven't increased for some reason. some potential reasons include changes to medication. engaging in more or less exercise and timing and quantity of food/drink intake. if you drank more alcohol on vacation for instance that could cause blood sugar spikes. if you have been checking your blood sugar -- and they have been good-- than i recommend contacting your doctor to see if your a1c was either an error or due to something else. good luck getting to the bottom of this!
why does a1c jump up? 6. 2-11. 4. over the last 2 years my a1c has been 7. 8--7. 4--6. 4--6. 2 then this past check-up it jumped to 11. 4. i have never had one that high. i have not changed my diet--i have actually shed about 10 more pounds. i don't understand what happened.