- All renal allograft biopsies performed in Princess Margaret Hospital (PMH) during the period 1st April 2003 to 31st August 2005 for unexplained acute renal dysfunction (Creatinine rise from baseline by ≥ 20%) or delayed graft function in the immediate post-transplantation period were included in the study. Both cadaveric and living-donor transplant allografts were included.