what does a1c measure

The A1C test (also known as the hemoglobin A1C or HbA1c test) measures your average blood sugar levels over the past 2 to 3 months. Here’s how it works:

• Hemoglobin and Glucose: When sugar enters your bloodstream, it attaches to hemoglobin, a protein in your red blood cells.
• 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 roughly every 3 months, the A1C test reflects your blood sugar levels over that period.

This test is used to:

• Diagnose prediabetes and diabetes.
• Monitor how well your diabetes is being managed.

For more details, visit the CDC's A1C Test page.