Figure 4.
Recombinant FIX–albumin fusion protein (rIX‐FP) activity in the one‐stage clotting assay with 14 different activated partial thromboplastin time (APTT) reagents: mean ± standard deviation (SD) percentage recovery for rIX‐FP across the range of spiked concentrations (1.0, 0.6, 0.3 and 0.05 IU mL −1) tested. The SDs thus represent the dilution linearity obtained with each APTT reagent. The black dashed line indicates the expected value of 100% of the nominal, and the gray dashed lines indicate the ± 25% and ± 35% interval around this expectation.