One of the factors that must be considered for safe blood transfusion is

One of the factors that must be considered for safe blood transfusion is the rhesus factor of the donor and the recipient. The rhesus factor is a protein found on the surface of red blood cells, and individuals can either be Rh-positive (have the protein) or Rh-negative (do not have the protein). If a Rh-negative person receives blood from a Rh-positive donor, their immune system can recognize the Rh protein as foreign and mount an immune response, which can result in hemolysis (destruction of red blood cells) and potentially life-threatening complications. Therefore, it is important to ensure that the donor and the recipient have compatible rhesus factors to prevent any adverse reactions during blood transfusion.