The indicators of blood glucose in patients with diabetes are very strict, and if the blood glucose is higher than the range often indicates a very serious condition. Mainly refers to the diagnostic criteria of blood glucose for acute complications, for example, blood glucose >13.8 mmol/l is often prone to acute complications such as diabetic ketoacidosis. This condition is more serious, so this indicator of 13.8 is a very critical indicator. Above this standard indicates that the entire condition must be taken more seriously, because once a patient develops acute ketoacidosis, it may have a significant impact on the body’s metabolic function. Especially in elderly diabetic patients, there is a degree of organ failure in the whole body. In this case if combined with this severe metabolic acidosis, the patient’s life are very threatened, so it should be clear that such an indicator as 13.8 mmol/l is a range that must be controlled for diabetic patients.