Mismatched Unrelated Donor

**Semantic type:** Qualitative Concept

**Definition:** A donor who is not related to the transplant recipient, and who is not a human leukocyte antigen (HLA) tissue type match at one or more of the following loci: HLA-A, HLA-B, HLA-C, and HLA-DRB1.

**Synonyms:** - MMUD - Mismatched Non-Related Donor, Mismatched Donor