“…These guidelines are formulated from expert opinion and based on the requirements of the Blood Safety and Quality Regulations (BSQR, ), and the recommendations of Clinical Pathology Accreditation (CPA, ), Guidelines for Blood Transfusion Services in the UK (UK Blood Transfusion Services, ), the UK Transfusion Laboratory Collaborative (Chaffe et al ., ), and data from UK NEQAS (BTLP) (Knowles et al ., ; UK NEQAS ANNUAL REPORTS) and the Serious Hazards of Transfusion (SHOT) haemovigilance scheme annual reports (SHOT, ). Where evidence exists to support new and potentially contentious recommendations, this is referenced in the text.…”