What is anti-M factor in a Rh-a blood group?

Anti-M factor is an antibody that can be present in individuals with the M blood group, which is part of the MNS blood group system. It is formed in response to exposure to M antigen, typically through transfusion or pregnancy. In the context of blood transfusions, the presence of anti-M can lead to hemolytic reactions if compatible blood is not used. Thus, it is important to identify and consider the presence of anti-M in blood transfusion and organ transplantation scenariOS.