A discordant, high factor viii patient result (chromogenic factor viii assay) was generated on the bcs xp system compared to a chromogenic factor viii assay patient result generated at another reference lab (esoterix).A different patient sample (from the same patient) was used at esoterix, but it is not known what system was used.Factor viii activity was also high on that patient sample on the bcs xp system compared to the factor viii activity result generated at the reference lab (esoterix).Quality controls were in range.There are no reports of patient intervention or adverse health consequence due to the discordant, high factor viii patient result.
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