[Characteristic of adverse reactions after blood components transfusion].

The adverse transfusion reaction is usually defined as an unwanted reaction occurring in a recipient during or after a blood transfusion or its components. Adverse reaction can occur even in 10% of recipients. The after transfusion reactions can be divided with regard to its causes: infectious and non-infectious, of immunologic and non-immunologic. Blood component transfusions can be related to unfavorable transfusion reaction of early or delayed character.