Tissue typing is the process by which an individual's human leukocyte antigens (HLA) are determined. In transplantation, this vital process allows the immunologic or rejection risk of a donor-recipient pairing to be assessed through reviewing their HLA matching and whether any anti-HLA antibodies present in recipient serum are donor specific. Tissue typing has increased in sophistication over time which has allowed a deeper appreciation of the antigenically important parts of HLA and increased the complexity of determining immunologic risk.
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