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I always considered antibody identification both art and science with a little magic thrown in for good measure.

Assuming that most patient samples are tested against screening cells that do not have a K+k- cell, is the exclusion of anti-K1 using a screening cell with heterozygous expression allowable if the antibody screen result is negative but not allowable if the antibody screen result is positive? If the facility endorses a computer "crossmatch" with a negative antibody screen (using a K+k+ cell) do you require additional testing with a K+k- cell to exclude anti-K1? Ours does not - but we also allow exclusion of anti-K1 with a K+k+ cell for any patient.