Blood glucose mainly refers to the content of glucose in human venous blood, and the indicator of blood glucose level for diabetic patients, generally speaking, fasting blood glucose over 7.1mmol/l, random blood glucose over 11.1mmol/l or OGTT 2 hours blood glucose over 11.1mmol/l, under the premise of three more and one less symptoms can be diagnosed diabetes. 11.1mmol/l becomes abnormal glucose tolerance, less than 7.8,mmol/l is normal. Fasting glucose between 6.1-7.0 is impaired fasting glucose regulation, less than 6.1mmol/l is normal.