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The A1C test is a common blood test used to diagnose type 1 and type 2 diabetes and then to gauge how well you're managing your diabetes. The A1C test goes by many other names, including glycated hemoglobin, glycosylated hemoglobin, hemoglobin A1C and HbA1c.
The A1C test result reflects your average blood sugar level for the past two to three months.
An A1C level below 5.7 percent is considered normal. An A1C between 5.7 and 6.4 percent signals pre-diabetes. Type 2 diabetes is diagnosed when the A1C is over 6.5 percent. For many people with type 2 diabetes, the goal is to lower A1C levels to a healthier percentage.