Abstract
European Union member states must have national haemovigilance reporting of serious adverse reactions and events. We sent national competent authorities an email questionnaire about data validation. Responses were received from 23/27 countries. Nine previously had no national haemovigilance system. In 13 (57%), the serious adverse reactions and events can be verified. Coverage of blood establishments is documented in 20 systems (87%) and of hospitals in 15 systems (65%). Although all member states have implemented haemovigilance systems, there are currently wide variations in data quality assurance, not allowing comparisons between countries.
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