In the last 4 years, 210 human cadaver kidneys have been stored by pulsatile perfusion for periods ranging from 4 1/2 to 50 hr. Of these 210 kidneys, 180 were subsequently transplanted. The following results are reported: incidence of postoperative dialysis for tubular necrosis, final renal function, complications, and patient and graft survival. Perfusion characteristics combined with warm ischemia time and donor serum creatinine at time of death have proved to be excellent criteria for graft viability. The clinical results show that this method of storage is efficient, reliable, and produces kidneys of excellent quality.