title: A review of the present status of preoperative hemoglobin requirements.
mesh_terms: D006400:Hematocrit; D006452:Hemoglobinometry; D006454:Hemoglobins; D006801:Humans; D007600:Judgment; D011300:Preoperative Care; D013514:Surgical Procedures, Operative
chemical_list: D006454:Hemoglobins