The A1C test is a common blood test used to diagnose type 1 and type 2 diabetes. It is also known as the glycated hemoglobin, glycosylated hemoglobin, hemoglobin A1C, or HbA1c test. For those living with diabetes, this test monitors blood sugar management.


An A1C test measures the percentage of hemoglobin proteins in your blood coated with sugar (glycated). Hemoglobin proteins in red blood cells transport oxygen throughout your body.


Higher A1C levels indicate poorer blood sugar control and an increased risk of diabetes complications. Regular testing helps manage diabetes and prevent complications.