Percentages of kidneys not transplanted out of all kidneys recovered for transplant, by DCD/DBD and KDPI donor classification. The reference population for the KDRI to KDPI conversion is all deceased donor kidneys recovered for transplant in the US in 2014. Kidneys recovered en-bloc are counted once. DBD, donation after brain death; DCD, donation after circulatory death; KDPI, kidney donor profile index; KDRI, kidney donor risk index.