AB blood group is one of the ABO blood group system. There is no good or bad difference between different blood groups, and there is no benefit or disadvantage of AB blood group compared to other blood groups. In the ABO blood system, there is a distinction based on the difference of antigenic substances on the hemoglobin of the body’s blood. hemoglobin of people with AB blood type contains A antigenic substances and B antigenic substances. In emergency situations, AB blood type can be transfused with other blood types of ABO blood, so AB blood type is also called “universal recipient”. However, it should be noted that excessive transfusion of other types of blood for people with AB blood type may also lead to discomfort and even hemolytic reactions, which may affect life safety. Some people believe that people with AB blood type have a higher probability of heart disease, pneumonia, urethritis and alcoholism, and have a stronger immune system, but these claims have not been confirmed by scientific research. In addition to the ABO blood group system, there is also the Rh blood group system for common blood typing. The typing results of the Rh blood group system can be checked by blood group testing, and are divided into Rh-positive and Rh-negative blood groups according to whether the body’s blood hemoglobin contains substance D or not. The same type of blood should be transfused between different blood group systems to avoid the effect of heterotypic transfusion on the body. When you need blood, you should go to a regular institution for transfusion treatment to avoid cross-infection and other blood-borne diseases.