A series of cases and scenarios are described to highlight pitfalls in the interpretation of laboratory results in people with haemophilia receiving treatment. This includes assays which grossly exaggerate levels due to in vitro phenomenon and how results which over or under-estimate true values could lead to under or over treatment, unnecessary clinical concern and impact on EQA performance.
Keywords: EHL; EQA; Emicizumab; Factor; Haemophilia; Laboratory.
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