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The chart comparing average blood sugar and A1c is just a ballpark 
figure.  For example, even if it were possible to have a reading of 150 at 
every single bg test, it's highly unlikely that A1c would be 7.0, because 
A1c  measures the average blood sugar 24 hours per day, 7 days per week - 
not just at the times it is tested.  Though it's commonly considered to 
represent an average for 3 months, A1c is somewhat weighted, with the bgs 
of the most recent 4-6 weeks having more effect on the total than the 
previous 4-6 weeks.  Another factor, of course, is that home use meters are 
not completely accurate,  and by industry standards can vary 15% from lab 


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