There is nothing inherently advantageous about the AB blood type. AB blood type is just one of the blood type system, and there is no difference between good and bad between different blood types. If there is an emergency, AB blood type people can not only accept AB blood type, but also can input A, B, O blood type, but the amount of blood transfusion can not be too large, so AB blood type people can also be called “universal recipients”. However, there are certain risks associated with the importation of other blood types, so unless there is an emergency, AB blood type patients can only be transfused with AB blood products. In addition to the ABO blood group system, the Rh blood group system is also commonly used in clinical practice, and is generally categorized into Rh-positive and Rh-negative blood. For most Chinese people, Rh-positive blood is more common.