Diabetes diagnosis criteria: The diagnosis of diabetes is based on blood glucose and clinical symptoms. The following diagnostic criteria were published by WHO and IDF in 1999 and recognized and recommended by the Chinese Medical Association in the same year: (a) Diagnosis of diabetes: 1. With typical symptoms, fasting blood glucose 7.0mmol/l or postprandial blood glucose ≥ 11.1mmol/l. 2. Without typical symptoms, only fasting blood glucose 7.0mmol/l or postprandial blood glucose 11.1mmol/l should be repeated once more. If the blood glucose still reaches the above value, the diagnosis of diabetes can be confirmed. 3, no typical symptoms, only fasting blood sugar 7.0mmol/l or postprandial blood sugar 11.1mmol/l, glucose tolerance test 2 hours blood sugar 11.1mmol/l can be diagnosed as diabetes. (B) Diabetes can be excluded: 1. If the glucose tolerance 2-hour blood sugar between 7.8-11.1mmol/l is low glucose tolerance (abnormal) – IGT; if fasting blood sugar 6.1-7.0mmol/l is impaired fasting blood sugar IFG, both are not diagnosed as diabetes. IGT and IFG can be said to be an excessive state of normal people to diabetes. Although this part of people are not diabetic now, they have a very high risk of type 2 diabetes in the future, and can be said to be the reserve army of diabetes. According to the study, 5-8% of IGT people will develop type 2 diabetes each year. In addition, the risk of cardiovascular disease, such as myocardial infarction and angina pectoris, is also greatly increased in IGT patients. 2. If postprandial glucose <7.8 mmol/l and fasting glucose <5.6 mmol/l, diabetes can be excluded. 【Note】 1.Severe symptoms and obvious hyperglycemia require blood glucose values exceeding the above indicators to confirm the diagnosis. 2.In acute infection, trauma, surgery or other stressful situations, although obvious hyperglycemia is measured, it cannot be diagnosed as diabetes immediately.