Hemoglobin A1c is used clinically as a biomarker for the diagnosis and management of diabetes mellitus. Various methods are available to measure HbA1c and each has advantages and limitations. The ...

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 ...