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Blood products for illnesses or surgical intervention The amount of blood components (erythrocytes, platelets and plasma) to be administered depends on each illness and type of surgical intervention and on whether the patient is a child or an adult. A list of some of the situations under which a transfusion is normally necessary and the average amount of blood components required is set out below. BLOOD COMPONENTS (amount) Erythrocytes Platelets Plasma Cardiac surgery in adults 2 1 0 Cardiac surgery in children 6 0 6 Spinal column intervention 5 0 0 Knee prosthesis 1 0 0 Hip prosthesis 2 0 0 Hip replacement prosthesis 4 0 0 Chronic anaemia by affectation of the bone marrow in adults 2 per month 1 per week 0 Congenital deficiencies with thalassemia major (adults and children) 2 per month 0 0 Own bone-marrow transplant in children 1 per month 1 per month 0 Compatible donor bone-marrow transplant in children 30 per month 60 per month 0 Liver transplant 8 8 8 Lung transplant 6 6 6   Up