Among the acute complications of diabetes, the most common is ketoacidosis, and the diagnosis requires test indicators. This indicator is mainly three: 1) elevated blood glucose, usually above 13.8 mmol/l, or even up to 20 mmol/l in severe cases; 2) clear positive ketone bodies; 3) blood gas analysis with a pH value of less than 7.35. As long as these three conditions are met, the diagnosis of diabetic ketoacidosis can be made. A positive ketone body can be achieved by taking the blood ketone test method or the urine ketone test method. In clinical practice, for various reasons, urine ketone is still used in many places to assess whether ketosis exists. If a patient’s blood gas analysis indicates a PH value less than 7.35, this state can be accurately determined as metabolic acidosis, and then combined with a positive ketone body can be directly diagnosed as diabetic ketoacidosis. This is such a diagnostic process, according to which the patient can take timely treatment measures such as rehydration and insulin use.