The A1C Test & Diabetes

The A1C test is a blood test that provides information about average levels of blood glucose over the past 3 months. The A1C test is based on the attachment of glucose to hemoglobin, the protein in red blood cells that carries oxygen. National Institute of Diabetes & Digestive and Kidney Disease https://www.niddk.nih.gov/health-information/diabetes/overview/tests-diagnosis/a1c-test