When the A1c test is used to diagnose diabetes, an A1c level of 6.5 percent or higher on two separate tests indicates you have diabetes. A result between 5.7 and 6.4 percent is considered prediabetes, which indicates a high risk of developing diabetes.
For most people who have previously diagnosed diabetes, an A1c level of 7 percent or less is a common treatment target. But, remember, the higher your A1c level, the higher your risk of diabetes complications.
Here’s how the A1c level corresponds to average blood sugar level, in milligrams per deciliter (mg/dL) and millimoles per liter (mmol/L):
|A1c level||Estimated average blood sugar level|
|5 percent||97 mg/dL (5.4 mmol/L)|
|6 percent||126 mg/dL (7 mmol/L)|
|7 percent||154 mg/dL (8.5 mmol/L)|
|8 percent||183 mg/dL (10.2 mmol/L)|
|9 percent||212 mg/dL (11.8 mmol/L)|
|10 percent||240 mg/dL (13.3 mmol/L)|
|11 percent||269 mg/dL (14.9 mmol/L)|
|12 percent||298 mg/dL (16.5 mmol/L)|
|13 percent||326 mg/dL (18.1 mmol/L)|
|14 percent||355 mg/dL (19.7 mmol/L)|