A correlation was found between the level of the tissue enzyme activity in cadaveric kidneys perfusates and the degree of their functional adequacy in the early posttransplantation period. According to the data obtained the level of the activity of leucin aminopeptidase and gamma-glutamyltranspeptidase in the perfusates may be of importance for prognostication of a delayed function of the kidneys after transplantation. An elevated level of activity, in addition to leucin adminopeptidase and gamma-glutamyltranspeptidase, lactatedehydrogenase, aspartataminotransferase, muramidase, acid and alkali phosphatases suggests the transplanted kidney to be not functioning.