In Brief:
In 285 patients who underwent posterolateral fusion, body mass index (odds ratio [OR] = 1.06), number of levels fused (OR = 2.50), and number of transforaminal interbody fusions performed (OR = 2.41) were independent risk factors for autologous cell saver transfusion. Autologous cell saver transfusion did not reduce the requirement for intraoperative or postoperative allogeneic transfusion.