TF and Tangier disease: Just over two-thirds (n= 12/18, 66.7%) of the patients who received red cell products met the study criteria for iron overload according to serum ferritin and transferrin saturation levels; the remainder either did not meet the criteria for transfusion-related iron overload or did not have ferritin and/or transferrin saturation testing performed (3/18, 16.5% each).