Table 2. Definitions of the Numbers Describing HLA Antigens and Alleles Matching

If These HLA Antigens and Alleles Match: Then the Donor Is Considered to be This Type of Match:
A, B, and DRB1 6/6
A, B, C, and DRB1 8/8
A, B, C, DRB1, and DQB1 10/10
A, B, C, DRB1, DQB1, and DPB1 12/12

From: Pediatric Allogeneic Hematopoietic Stem Cell Transplant (PDQ®)

Cover of PDQ Cancer Information Summaries
PDQ Cancer Information Summaries [Internet].
Bethesda (MD): National Cancer Institute (US); 2002-.
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