This study uses existing transplant data obtained from a national public donor registry operated by the Organ Procurement and Transplant Network (OPTN) under Health Resources and Services Agency (HRSA) to evaluate outcomes associated with normothermic machine perfusion (NMP) of deceased donor kidneys. Currently, there is no method to study NMP kidney outcomes using the National Scientific Registry for Transplant Recipients (SRTR) national public registry, because no data field exists to identify which kidneys received NMP.