HbA1c is a blood test that is used to help diagnose and monitor people with diabetes. It is also sometimes called glycated hemoglobin and measures the average blood sugar level attached to the hemoglobin over the past 2 to 3 months. Everybody has some sugar attached to their hemoglobin, but people with higher blood sugar levels have more. The HbA1c test measures the percentage of your red blood cells that have sugar-coated hemoglobin.
People with diabetes and pre-diabetes should go for an HbA1c test every 3 months. A healthy person or a person with a family history of diabetes should go for this test every 6 months.