Blood sugar 8.0mmol/L, if the fasting blood sugar reaches 8.0mmol/L, it is considered to be diabetes and can be diagnosed as such, because the fasting blood sugar for the diagnosis of diabetes can be diagnosed as long as it is greater than or equal to 7.1mmol/L. If blood glucose 8.0mmol/L is two hours after meal, it is not considered to be diabetes. Consider impaired glucose tolerance, because the range of impaired glucose tolerance is between 7.8-11.1mmol/L. In order to make a clear diagnosis of diabetes, it is recommended to do OGTT test to make a clear diagnosis. Doing OGTT for fasting glucose, one hour glucose, and two hour glucose ultimately confirms the diagnosis of diabetes.