Haemovigilance systems must establish a blood safety surveillance policy to be followed by blood establishments and transfusion services. Example resources for these are available from WHO in the information sheet for national health authorities on blood transfusion safety. Other resources are available in the WHO guide to establishing a national haemovigilance system, and can be found in this directory. 


Each haemovigilance system must develop procedures that include information for blood establishments and transfusion services on what information to report to the national system. Procedures should be established for how to report, the reporting forms required, where to report, and how often and when to report adverse events or summaries thereof.