1. glycosylated hemoglobin A 1C≥6.5%.

2. Fasting blood sugar FPG≥7.0 mmol/L, which means that you have not taken calories for at least 8 hours.

3. Oral glucose tolerance test OGTT 2-hour blood glucose ≥11.1mmol/L, the experiment should be carried out according to the standards of the World Health Organization, with 75 grams of anhydrous glucose dissolved in water as the sugar load.

4. For those with hyperglycemia symptoms or hyperglycemia crisis, the random blood glucose is ≥11.1mmol/L ... If there are no hyperglycemia symptoms, the standard 1-3 should be tested again to confirm the diagnosis.

Symptoms, three more and one less, are drinking more, eating more, urinating more and losing weight.