 The criterion for the transfusion of blood products is a hemoglobin level of 8.0 gdL if the patient developed intolerable symptoms of anemia or any comorbidities that may have been related to anemia and was not attributable to another cause or ongoing blood loss was occurring. If transfusion is necessary, the amount of units of packed red blood cells is estimated according to the hemoglobin level or the severity of symptoms with the intention to increase the hemoglobin level to 8.0 gdL. 