RESUMO
Serious hazards of transfusion(SHOT)in the United Kingdom has been received reporting of the adverse events of delayed transfusion for more than ten years. Hemovigilance Module Surveillance Protocol in Biovigilance Component in National Healthcare Safety Network in the United States updated the incident codes to include under-transfusion with the creation of a new process code: no blood (NB) and four incident codes in October 2022. This review introduces the monitoring practice of delayed transfusion/under-transfusion in the UK and the USA, makes a suggestion to incorporate delayed transfusion/under-transfusion due to blood shortage into the national health standard on the classification of transfusion reactions and haemovigilance protocol in China, and to do a national survey as well, therefore the real world data and evidences would be obtained and used for further policy making.