Diabetes is often called a “silent disease” because it can cause serious complications without symptoms. A person with diabetes may feel healthy and still have too high a level of blood glucose. It is important to know how well you are managing your blood glucose level. Hemoglobin A1C is a measure of your average blood glucose levels that helps your health provider see how well you are managing your diabetes over time.
Adams, Ingrid, "Diabetes and Hemoglobin A1C " (2015). Family and Consumer Sciences Publications. 87.