The genomic dna sample was sent to grifols laboratory solution for dna sequencing.Dna sequencing interrogated specific sequences: kel gene exons 1-9.The kel genotype detected two kel*k alleles in agreement with id core xt but also a homozygous mutation c.1546c>t reported as ko allele kel*02n.17.This mutation is associated with a null ko phenotype which explains the serology discrepancy.Id core xt reported a predicted k+ phenotype, but kel*02n.17 allele is associated with a predicted k- phenotype.This false positive result obtained by id core xt is considered a discrepant result and then a malfunction.This case report is associated with limitations of id core xt assay, as described in the id core xt package insert (sec 1 and 10 assay limitations).
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It was reported that the sample 8074933, from madrid blood transfusion center, was tested with serology.The test result was negative (k-), which contrasted with the molecular typing performed on (b)(6) 2023, using the id core xt assay which provided positive results (k+) with id core xt analysis software v3.0.2.
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