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performed. A negative cross match says to the recipient, you are not likely to reject the donor organ and the operation should be performed. If we look at the cross match in this way, the positive and negative results make sense to all concerned. A well matched kidney is one in which the blood type between the donor and recipient are
1 Immunological tests: A blood sample is taken for the following tests: 2  Blood type. The blood type (A, B, AB, or O) must be compatible between the donor and recipient. Blood type requirements of the kidney donor are the most important matching factor.  Human leukocyte antigens (HLAs).