Home > Diabetes > What is A1c testing? Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Aug 22, 2008 by SSreenan, Views: 4511 What is A1c testing? The A1c or the HgA1c is a blood test that gives an average of the blood sugars over the prior 3 months. The goal HgA1c for diabetics is less than 7%. The better blood sugars are controlled, the lower the HgA1c will be.