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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 7 out of 10 people who require a bone marrow transplant do not have a matching donor in their family, and rely on the registry of bone marrow donors to find a match. 2  The process for matching a patient with a donor involves comparing human leukocyte antigen (HLA) types in order to find a match.one marrow is soft, gelatinous tissue that fills the medullary cavities-the centers of bones. There are two types of bone marrow: red bone marrow (also known as myeloid tissue) and yellow bone marrow (fatty tissue).