Glycosylated hemoglobin: less than 6.0mmol/l (check the overall blood glucose change in the past three months) Blood glucose concentration unit: mmol/l Venous (whole blood) Capillary Venous (plasma) (diabetes) Fasting ≥6.1 ≥6.1 ≥7.0 2 hours after taking sugar ≥10.0 11.1 ≥11.1 (impaired glucose tolerance) Fasting <6.1 <6.1 <7.0 2 hours after taking sugar ≥6.7 ≥7.8 ≥7.8 (Impaired fasting glucose) Fasting >5.6<6.1 >5.6<6.1 ≥6.1<7.0 2 hours after taking sugar <6.7 <7.8 <7.8 [Some notes on diagnostic requirements (a) Diagnosis of diabetes mellitus: 1. with typical symptoms, fasting glucose 126mg/dl (7.0 mmol/l) or postprandial glucose ≥200mg/dl (11.1 mmol/l). 2.No typical symptoms, only fasting blood glucose 126mg/dl (7.0 mmol/l) or postprandial blood glucose 200mg/dl (11.1 mmol/l) should be repeated once again, and those who still reach the above value can be diagnosed as diabetes. 3.No typical symptoms, only fasting blood sugar 126mg/dl (7.0 mmol/l) or postprandial blood sugar 200mg/dl (11.1 mmol/l) glucose tolerance test 2 hours blood sugar 200mg/dl (11.1mmol/l) can be diagnosed as diabetes. (2) Diabetes can be excluded: 1. If the glucose tolerance 2 hours blood sugar between 140-200 mg/dl (7.8-11.1 mmol/l), for glucose tolerance reduction; such as fasting blood sugar 110-126 mg/dl (6.1-7.0 mmol/l) for impaired fasting blood sugar, are not diagnosed as diabetes. 2. If postprandial glucose <140 mg/dl (7.8 mmol/l) and fasting glucose <100 mg/dl (5.6 mmol/l), diabetes can be excluded. Note 1. For those with severe symptoms and obvious hyperglycemia, the diagnosis can be confirmed if the blood glucose value exceeds the above index. 2.In acute infection, trauma, surgery or other stressful situations, although obvious hyperglycemia is measured, it cannot be diagnosed as diabetes immediately. 3. Asymptomatic people cannot be diagnosed according to one blood glucose value, but must exceed the diagnostic criteria at another time. 4. Most children with diabetes mellitus have serious symptoms, high blood sugar, positive urine sugar and urine ketone bodies, and do not need to do glucose tolerance test. A few people with less serious symptoms need to measure fasting blood sugar or glucose tolerance test. The World Health Organization's Diagnostic Criteria for Diabetes Mellitus, established in 1985, can be diagnosed as diabetes mellitus if one of the following criteria is met: 1. 2. When checking fasting blood sugar, it is higher than 7.8mmol/L (140mg/dl) twice or more. 3.If fasting blood glucose exceeds 7.8mmol/L and diabetes is suspected, oral glucose tolerance test can be done and blood glucose exceeds 11.1mmol/L 2 hours after taking sugar. if there is no diabetic symptom, another blood glucose exceeding 11.1mmol/L is still needed. the above blood glucose value is venous plasma glucose concentration. Diabetes diagnosis criteria proposed by the American Diabetes Association in 1997 1. diabetic symptoms and any blood glucose R11.1mmol/L. 2. fasting blood glucose R7.0mmol/L. 3. glucose tolerance test 2 hours blood glucose R11.1mmol/L. OGTT is still conducted according to the requirements of the World Health Organization. Patients who meet one of the above criteria will repeat the above tests on another day, and if they still meet one of the three criteria, they will be diagnosed with diabetes.