Generally, blood of the same type matches. Before transfusion, a cross-matching test is required, and neither the primary nor the secondary side clots before the blood can be transfused.
Before transfusion, the patient should be matched for blood type, and a primary and secondary cross-matching test should be performed, i.e., the red blood cells and serum of the recipient and the donor should be matched to see if the recipient and the donor will react to prevent hemolysis from occurring during the transfusion process.
Blood group matching is done by testing the blood group with A antigen, B antigen, O antigen or AB antigen, anti-A antibody and anti-B antibody. Under normal circumstances, blood transfusions are given to people with the same blood type, such as A blood type for people with A blood type and B blood type for people with B blood type.
In case of emergency, people with blood type AB can receive blood transfusion of any blood type, but do not transfuse a large amount of blood to avoid transfusion reaction, and blood type O can be transfused to people with any blood type.
If there is a large amount of blood loss phenomenon, must stop the bleeding in time, blood transfusion must be blood type testing and matching, and do a good job of all infectious diseases, the specific whether the blood transfusion, need to be decided by the doctor.