how do you calculate a1c

The A1C test measures the percentage of your red blood cells that have sugar-coated hemoglobin, reflecting your average blood sugar levels over the past 2-3 months. Here’s how it works:

• Hemoglobin and Glucose Binding: Glucose in your bloodstream attaches to hemoglobin, a protein in red blood cells.

• Measurement: The A1C test calculates the percentage of hemoglobin that is glycated (coated with sugar).

• Formula: While the test itself is performed in a lab, the estimated average glucose (eAG) can be calculated using the formula:

  eAG (mg/dL) = 28.7 × A1C - 46.7

For example, if your A1C is 7%, your estimated average glucose would be approximately 154 mg/dL.

This test is crucial for diagnosing and managing diabetes and prediabetes.