The A1C test may give false results in people with certain conditions. Having prediabetes is a risk factor for developing type 2 diabetes. Within the prediabetes A1C range of 5.7 to 6.4 percent, the higher the A1C, the greater the risk of diabetes.

Is A1C always accurate?

The A1C test provides an average of your blood sugar readings for the past 3 months. It's not accurate for any given day, but it gives your doctor a good idea of how effective your blood sugar control has been over time.

How often are A1C tests wrong?

"The A1c missed almost 73% of the people with diabetes in comparison to the oral glucose tolerance test," says Maria Mercedes Chang Villacreses, MD, a clinical endocrinology fellow at the City of Hope Diabetes and Metabolism Research Institute in Duarte, California, who introduced the findings at the annual meeting of ...