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\ ˌāch-ˌā-ˌwən-ˈsē 
\
\Definition of HA1c
: hemoglobin a1c The HA1c test gauges average blood sugar levels over a period of 2-3 months by measuring how much glucose is attached to red blood cells. — Food & Fitness Advisor
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The first known use of HA1c was in 2002
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