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1. comparison and selection of objects having similar or identical characteristics.
2. the selection of compatible donors and recipients for transfusion or transplantation. See also typing.
3. the selection of subjects for clinical trials or other studies so that the different groups being compared are similar in specified characteristics, e.g., age, sex, or race, in order to reduce bias caused by comparison of dissimilar groups. Matching may be on an individual (matched pairs) or a group-wide basis.
cross matching crossmatching.
The process of determining the compatibility of blood from a donor with that of a recipient before transfusion.
a procedure vital in blood transfusions and organ transplantation. The recipient's erythrocytes or leukocytes mixed with the donor's serum and vice versa. Absence of agglutination, hemolysis and cytotoxicity indicates that the donor and recipient are blood group compatible or histocompatible.