My hemoglobin A1c has always been higher than it should be on the basis of my daily blood glucose (BG) readings. I've spent about $500 on sensors for a continuous glucose monitor (CGM) to see if I was going high at unexpected times.
I wasn't.
I showed a printout of a daily CGM chart to an endocrinologist whose knowledge I respect, and he said the most common cause of higher-than-expected A1c is having a meter that reads too low. And of course one calibrates the CGM with the...
