In a cohort of 700 kidney transplant recipients with a mean (SD) estimated glomerular filtration rate (eGFR) of 52.3 (20.2) ml/min per 1.73 m2, 30% of the patients had ID (transferrin saturation [TSAT] <20% and ferritin <300 ng/ml) without anemia (World Health Organization criteria: Hgb <13.0 g/dl for men and <12.0 g/dl for women) and 34% had anemia without ID.24 This evidence concerns the gene TF and anemia.