Theoretically, AB blood can accept blood of any blood type because AB plasma does not contain anti-A and anti-B antibodies, so it can accept blood transfusion of any blood type, and generally no obvious transfusion reaction will occur. However, blood transfusion is based on the principle of homotypic blood, and AB blood can only be transfused with non-homotypic blood as a last resort, and the speed of transfusion should not be too fast and the amount of blood transfused should not be too large. If the transfusion speed is fast and the transfusion volume is large, it may also induce serious transfusion reactions. Therefore, although AB blood type can accept any blood type and is called the universal recipient, it is still the principle to try to transfuse homozygous blood to avoid the occurrence of hemolytic reaction and harm to the patient.