title: Hemoglobin level and anesthesia.
mesh_terms: D000768:Anesthesia, General; D001803:Blood Transfusion; D006400:Hematocrit; D006454:Hemoglobins; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007501:Iron / Q000627:therapeutic use
chemical_list: D006454:Hemoglobins; D007501:Iron