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Mean FIX activity of recombinant FIX–albumin fusion protein (rIX‐FP) concentrate when measured against the World Health Organization (WHO) International Standard concentrate with different activated partial thromboplastin time (APTT) reagents. FIX activity of rIX‐FP concentrate was measured in the one‐stage clotting assay against the WHO International Standard FIX concentrate with eight different APTT reagents and the central laboratory assay reagent Pathromtin SL.
