Intensive care unit blood transfusion. Drip chamber (centre) with blood passing through it, part of a set up where an infusion set is being used during a blood transfusion. The blood consists of packed red blood cells, a processed component of donor blood that is often given to patients rather than whole blood. The red blood cells help restore the oxygen-carrying capacity of the patient's blood. There are multiple intravenous (IV) infusion pumps in use for this patient. Photographed in a hospital intensive care unit (ICU).