MODEL RELEASED. Paediatric blood transfusion. Young boy with blood-filled tubing attached to his arm during a blood transfusion. The blood is coming from the blood bag (upper right), which is elevated to allow gravity to provide pressure to add the blood to his bloodstream through a needle placed in his arm. Blood transfusions are carried out to replace blood in people with blood disorders, or those who have lost blood through trauma or surgery. The blood group and type needs to be matched to that of the patient. Common blood disorders that can require regular transfusions include thalassaemia, anaemia and haemophilia.