what does the a1c test 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 every 3 months, the test reflects your blood sugar levels over that period.

This test is used to diagnose prediabetes and diabetes and to monitor how well your diabetes is being managed. It provides a more comprehensive picture than daily blood sugar checks, which only show your levels at a single point in time.