Which of the following transfusions are ABO-compatible?

The transfusion of blood from a B type donor into an AB type recipient is ABO-compatible because the AB blood type has both A and B antigens on the surface of its red blood cells, allowing it to accept red blood cells from both A and B blood types without causing an immune reaction. The recipient's immune system does not recognize the B antigen as foreign, making this transfusion safe and effective.

In the context of blood transfusion, compatibility is critical to avoid hemolytic reactions that can occur when incompatible blood types are mixed. Understanding the properties of different blood types and their corresponding antigens is essential in evaluating which transfusions will be safe for patients. Here, the AB recipient can receive B type blood because they do not have anti-B antibodies that would react against the B antigens present in the transfused blood.

Other mentioned transfusions would involve potential reactions: transfusing A blood into an O type individual would expose the O type to A antigens, which they cannot tolerate as they would produce anti-A antibodies. Similarly, O blood into B could lead to reactions due to the presence of anti-B in type O blood, and AB into B would introduce A antigens into the B recipient’s blood, causing an immune response. Understanding