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The genomic dna sample was sent to grifols laboratory solutions for dna sequencing (ngs).The ngs sequencing interrogated kel promoter and exons 1-19, identifying the variant kel* c.2107 g>c in heterozygosis.The inferred genotype of sequencing is kel*01m.06(1680a), kel*k (kel*02) as described by isbt, and its predicted kmod phenotype would be associated with no expression of kell antigens.Id core xt reported a predicted k+ phenotype, but kel* c.2107 g>c variant, not interrogated by id core xt, is associated with k- phenotype.The 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 w051523064512, from memorial blood center, was tested with serology providing a negative result (k-), which contrasted with the molecular typing performed on 30nov23 using the id core xt assay which provided positive results (k+) with id core xt analysis software v3.0.4.1.
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