 The prevalence of total hip arthroplasty THA is increasing and the accompanied blood loss cannot be overlooked. In 2007, 17,347 patients underwent THA in Belgium and that number grows every year by an average of 2.9. The average amount of blood loss associated with THA was ranging from 1000 to 2000mL. Therefore the substantial perioperative blood loss frequently necessitates blood transfusion. Although complications have decreased, morbidity and high costs due to blood transfusion still exist. 