I've compared the estimated value to my lab results over the past year and found as much as 25% difference. That said, I don't blame the app as it can only be as accurate as the data provided. Unless you're recording your glucose levels every hour, 7 days a week, the calculated value is going to be biased based on when and how often you record your readings.
From my results, I'd say the calculated value is good for seeing a trend but if you really want to know your true A1C, see your doctor.
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