Diabetes diagnosis criteria 1, diabetic symptoms + plasma glucose level ≥ 11.1mmol/l (200mg/dl) at any time 2, fasting plasma glucose (FPG) level ≥ 7.0mmol/l (126mg/dl) 3, oral glucose tolerance test (OGTT), 2hPG level ≥ 11.1mmol/l (200mg/dl) Diabetes diagnosis criteria for children are the same as those for adults Diabetes diagnosis points to note In the absence of hyperglycemic crisis, those whose blood glucose value reaches the diabetes diagnosis criteria at one time must be retested on another day according to one of the three criteria in the diagnosis criteria to verify. If the re-test does not reach the diagnostic standard of diabetes, it should be rechecked in the follow up. Temporary increase of blood glucose may occur in acute infection, trauma, circulation or other stressful situations, and the diagnosis of diabetes cannot be made on this basis, and it should be rechecked after the stressful situation. During the test, no drink, no aspiration, no strenuous exercise and no bed rest are required. Blood is taken 30 minutes, 1 hour, 2 hours and 3 hours after taking the first sip of sugar (for diagnostic purposes, only fasting and 2 hours blood can be taken), and plasma is separated and blood glucose is measured immediately or as soon as possible (not more than 3 hours). Insulin, C-peptide) Precautions: Daily carbohydrate intake should be at least 150 grams for 3 days before the test Discontinue drugs affecting OGTT such as contraceptives, diuretics, β-adrenergic blockers, phenytoin, niacin for 3-7 days before the test, and do not do OGTT if you are taking glucocorticoids.