Diabetes Tests | CDC
www.cdc.gov › diabetes › basicsFeb 28, 2023 · A fasting blood sugar level of 99 mg/dL or lower is normal, 100 to 125 mg/dL indicates you have prediabetes, and 126 mg/dL or higher indicates you have diabetes. Glucose Tolerance Test This measures your blood sugar before and after you drink a liquid that contains glucose.