A single fasting blood glucose of 6.17mmol/L does not meet the diagnostic criteria for diabetes, and is not considered diabetes, but only abnormal fasting glucose tolerance. Nowadays, the diagnosis standard of diabetes is that under the non-stress condition, if there are three symptoms of diabetes, such as excessive drinking, excessive urination, excessive eating and wasting, accompanied by one fasting blood glucose over 7.0mmol/L, or one two-hour postprandial blood glucose, or random postprandial blood glucose over 11.1mmol/L, then diabetes can be diagnosed. If there are no three symptoms of diabetes, it takes two fasting blood glucose over 7.0mmol/L or one fasting blood glucose over 7.0mmol/L and one postprandial or random blood glucose over 11.1mmol/L to diagnose diabetes. If the patient’s fasting blood sugar exceeds the normal value, but does not reach the standard of 7.0mmol/L, it is necessary to do OGTT, that is, glucose tolerance test to clarify what is the specific situation of blood sugar after sugar load, to see if the diagnostic standard of diabetes can be reached.