What does hba1c on a blood test mean?

Average glucose: Hb A1c reflects the average blood glucose level over the previous 3-4 months. It is usually used to monitor glucose control in diabetes. It is also beginning to be used for diagnosis of diabetes.

Glucose control: A hba1c test will show how well (or poorly) glucose control has been over the last few months. It is a way to test how well a patient is treating their diabetes.