Although blood transfusion saves lives and reduces the rate of morbidity in many clinical diseases and conditions, it is associated with certain risks. A transfusion-related adverse event, also called transfusion reaction, is any unfavourable event occurring in a patient during or after blood transfusion. About 0.5% to 3% of all transfusions result in some adverse events, but the majority of them are minor reactions with no significant consequences. In general, transfusion-related adverse events are categorized as infectious and noninfectious. However, there are other classifications in the...