Factors That Determine Intraoperative Blood Loss in Bimaxillary Osteotomies and the Need for Preoperative Blood Preparation

The factors that influence blood loss include patient gender, experience of the surgeon, and operative time. Blood preparation should be considered in women, especially small individuals in whom a long operative time is expected and who are being operated on by an inexperienced surgeon. Because of the low rate of transfusion, a group-and-save policy is appropriate.