HLA mismatchThe nonmatching of HLA antigen in recipients of renal and other allografts. See Transplantation. Cf HLA match.
HLA mismatch, human leukocyte antigen mismatch
The number of human leukocyte antigens (HLAs) found on the cells of a donor organ but not found on the cells of the organ recipient. The greater the disparity between the antigens, the lower the probability of a successful transplantation.