A blood glucose of 19 mmol/L often indicates that the patient’s blood glucose level is high, and when necessary, intensive insulin therapy is required, which means applying an insulin pump to give the patient 24-hour continuous subcutaneous injections of basal amount of insulin, with additional injections at mealtime. If an insulin pump is not used, a 1+3 regimen can be used, that is, one injection of long-acting insulin, plus three subcutaneous injections of mealtime insulin before meals, that is, short-acting insulin or short-acting preparations of insulin analogues, which can achieve blood glucose control. Both of the above are applied when the patient has no ketone bodies inside the urine or the blood ketones are negative, i.e. no diabetic ketoacidosis has occurred. Once the patient’s blood glucose reaches 19 mmol/L and there are ketone bodies in the urine, as well as high blood ketone bodies, and diabetic ketoacidosis occurs, the patient should be immediately hospitalized for rehydration treatment, replenish saline, let the patient drink as much water as possible when he can, and apply small doses of insulin, add insulin into saline with an intravenous pump, and maintain small doses to achieve the purpose of lowering sugar and eliminating ketones. Therefore, the clinic should choose different treatment plans according to the presence or absence of ketone bodies in the patient’s urine.