C. Ronald Kahn, M.D. President and Director, Joslin Diabetes Center What is the A1c blood test? The hemoglobin A1C test is a measure of what we call long term glucose control. The way this works ...

The A1C test, also known as an HbA1C, hemoglobin A1C, glycated hemoglobin, or glycosylated hemoglobin test, is a blood test used to diagnose and monitor diabetes. It shows your average blood sugar ...

An A1C test, also known as a hemoglobin A1C or HbA1C test, is a simple blood test that estimates your average blood sugar levels over the last three months. People who don’t have diabetes may be ...