Hébert PC et al, for the Transfusion Requirements in Critical Care Investigators, Canadian Critical Care Trials Group. A multicenter, randomized, controlled clinical trial of transfusion requirements in critical care. N Engl J Med 1999;340:409–417.
Association of Anaesthetists of Great Britain and Ireland. AAGBI guidelines: the use of blood components and their alternatives 2016. Anaesthesia 2016;71: 829–842.
National Institute for Health and Care Excellence. Blood Transfusion. NICE Guideline NG24. London: NICE; 2015 (https://www.nice.org.uk/guidance/ng24).
Retter A et al for the British Committee for Standards in Haematology. Guidelines on the management of anaemia and red cell transfusion in adult critically ill patients. Br J Haematol 2013;160:445–464.
Walsh T. 4.1.6 Anaemia. In: Faculty of Intensive Care Medicine and Intensive Care Society. Guidelines for the Provision of Intensive Care Services. Version 1.1. London: Faculty of Intensive Care Medicine; 2016. pp. 85–87.