The evaluation of a normal person’s blood glucose level includes two aspects, one is fasting blood glucose and one is two hours after meal blood glucose. The normal value of fasting blood sugar level for a normal person is between 3.9-6.1 millimoles per liter, and the blood sugar two hours after meal is below 7.8 millimoles per liter, so no matter fasting blood sugar or postprandial blood sugar, as long as it is higher than the normal value, it can be called high blood sugar. And the standard of hypoglycemia can also be divided into two, one is the standard of normal people hypoglycemia, normal people below 2.8 mmol per liter can become hypoglycemia, while diabetic patients are generally below 3.9 mmol per liter, it can be said that they have hypoglycemia, because the diagnosis standard of hypoglycemia in diabetes is slightly higher than normal people.