A postprandial blood glucose level of 20 points is very serious and if not treated in time may lead to acute complications of diabetes such as diabetic ketoacidosis or diabetic hyperosmolar coma. Postprandial blood glucose levels should normally be less than 7.8 mmol per liter, and diabetic patients need to control postprandial blood glucose levels to less than 10.0 mmol per liter, so a postprandial blood glucose level of 20 points is a very serious situation. It is necessary to seek medical attention as soon as possible to reduce blood glucose, if blood glucose continues to rise without control, it will lead to a large amount of glucose excreted in the urine, ketoacidosis, hyperosmolar coma and other diabetic complications, and even life-threatening in serious cases. It is recommended that patients with 20 points of postprandial blood glucose go to the hospital for glucose-lowering treatment in a timely manner to avoid serious consequences.