<prompt> TRALI occurs within how many hours of transfusion?6 hours12 hours48 hours72 hours  <response>: TRALI is defined as Transfusion Associated Acute Lung injury ALI that occurs within 6 hours of transfusion with the majority of patients developing clinical features within 1-2 hours of transfusion Usually 1 to 2 hours but up to 6 hours Ref: Harrisons 20th edition 