how does an a1c test work
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Community Answer
Answered by Dr. Emily Carter, MD
The A1C test, also known as the hemoglobin A1C or HbA1c test, measures your average blood sugar levels over the past 2-3 months. Here's how it works:
- Hemoglobin and Glucose Binding: When sugar enters your bloodstream, it attaches to hemoglobin, a protein in your red blood cells.
- Measurement of Glycated Hemoglobin: The A1C test measures the percentage of your red blood cells that have sugar-coated hemoglobin.
- Time Frame: Since red blood cells regenerate every 3 months, the test reflects your average blood sugar levels over that period.
Key Points:
- Normal Range: Below 5.7%
- Prediabetes Range: 5.7% to 6.4%
- Diabetes Range: 6.5% or above
This test is a crucial tool for diagnosing and managing diabetes, but it doesn't replace daily blood sugar monitoring.