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The painting above shows normal glomeruli, tubulointerstitium, and a normal artery from a pre-implantation wedge biopsy. Pre-implantation wedge biopsies, also known as donor biopsies, procurement biopsies, or harvest biopsies, are performed for extended criteria donor kidneys, high risk recovered donor kidneys, or at the request of the transplant surgeon, to evaluate for suitability for transplantation. Over 40% of procured kidneys are discarded prior to transplantation. The use of preimplantation kidney biopsies, performed as frozen sections at transplant centers, may reduce the discard rate by accepting kidneys that are histopathologically acceptable, as well as to avoid transplantation of sub-optimal organs. “Extended...