M
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In my opinion HbA1c by itself is an overrated metric. It is clearly important but it does not give any information regarding highs and lows. Glucostability is more important than average, and this data can only be gathered from a regular glucometer or CGM. Of even more importance is the requisite insulin profile, but for some reason that appears to be black magic mumbo jumbo among the mainstream. Very few doctors even care about it 
Answering the question, there can be many reasons why HbA1c wouldn’t reflect finger pricks. For the most part, the two should be reasonably well correlated, but the accuracy of expectations will depend on the frequency of finger testing, and the glucose variablity in between them.
Answering the question, there can be many reasons why HbA1c wouldn’t reflect finger pricks. For the most part, the two should be reasonably well correlated, but the accuracy of expectations will depend on the frequency of finger testing, and the glucose variablity in between them.