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The A1C test is a blood test that measures average blood sugar levels over the past 3 months.
The A1C test is used to diagnose prediabetes and diabetes, and to help manage diabetes.
No special preparation is needed.
A normal A1C result is below 5.7%.
Kidney failure, liver disease, anemia, certain types of hemoglobin, certain medications, blood loss or transfusions, early or late pregnancy can all affect the accuracy of an A1C result.
The A1C goal for most people with diabetes is 7% or less, but the individual goal may vary depending on age and other medical conditions.
https://www.cdc.gov/diabetes/managing/managing-blood-sugar/a1c.html