Distribution of unilaterally discarded kidneys by discard category and KDRI (n=7625 kidneys), 2000–2015. Distribution of unilaterally discarded kidneys by discard category and KDRI(n=7625 kidneys), 2000–2015. Organ damage and anatomical abnormalities were the most frequent reasons for discard among low-KDRI (i.e., high quality) kideys, but accounted for a decreasing fraction of discards as KDRI increased. Biopsy findings, poor function, and inability to locate a recipient accounted for an increasing fraction of discards as KDRI increased. IQR, interquartile range; KDRI, Kidney Donor Risk Index. Syed Ali Husain et al. CJASN 2018;13:118-127 ©2018 by American Society of Nephrology