Complete this section for all serologic typing. If serologic typing was not performed, leave this section blank. Report broad antigens only when your laboratory was not able to confirm typing for a known split antigen.

Each HLA locus has a serologically defined “X” antigen specificity: AX, BX, CX, DRX, DPX, and DQX. At this time, an “X” specificity is defined as “unknown but known to be different from the other antigen at that locus.” This is different from a blank specificity, which is assumed to be the same as the other antigen at that locus.” When comparisons between recipient and donor antigens involve an “X” or “blank” specificity, the “X” or “blank” is assumed to be homozygous for the antigen reported at the locus. In other words, the search algorithm treats typing containing “blank” or “X” antigens in the same manner as known homozygous typing.

Questions 25-27: Number of A antigens provided

Indicate if one or two HLA-A antigens were tested. If one antigen was tested, report the first antigen specificity in question 26 and continue with question 28.

If two antigens were tested, report the first antigen specificity in question 26 and the second antigen specificity in question 27. Continue with question 28.

Questions 28-30: Number of B antigens provided

Indicate if one or two HLA-B antigens were tested. If one antigen was tested, report the first antigen specificity in question 29 and continue with question 31.

If two antigens were tested, report the first antigen specificity in question 29 and the second antigen specificity in question 30. Continue with question 31.

Last modified: Jan 27, 2020

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