According to the CDC, an A1C level of 5.7% to 6.4% indicates prediabetes. The A1C test measures the average amount of sugar in your blood over the past few months, and it is used to help diagnose prediabetes and diabetes. The higher the A1C level, the greater the risk of developing diabetes complications. It is important to note that the A1C test should not be used to diagnose type 1 diabetes, gestational diabetes, or cystic fibrosis-related diabetes. If you have prediabetes, it is a risk factor for developing type 2 diabetes, and it is important to talk to your doctor about getting your blood glucose tested regularly.