What is defined as an adverse reaction that occurs due to blood transfusions?

A transfusion reaction is specifically defined as an adverse reaction that occurs due to blood transfusions. This can involve a range of symptoms and complications that arise when the recipient's immune system reacts negatively to the transfused blood. Such reactions can occur due to factors like incompatibility between donor blood and recipient blood types or the presence of antibodies in the recipient’s plasma.

Transfusion reactions can manifest in various ways, including fever, chills, itching, rash, and more severe complications like hemolytic reactions, where the recipient's immune system attacks the red blood cells in the donated blood. While allergic reactions and hemolytic reactions can be subsets of transfusion reactions, the broader term that incorporates all possible adverse responses to a blood transfusion is indeed a transfusion reaction. Thus, identifying this term is essential for understanding the potential risks associated with blood transfusions in clinical practice.