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Background  Clinical severity of hemophilia A (HA) varies, possibly due to interplay of many factors in the hemostatic pathway. Pharmacokinetic monitoring of factor VIII (FVIII) replacement therapy in HA patients consists of measuring FVIII activity levels and subsequent dose adjustment. The Nijmegen Hemostasis Assay (NHA) measures thrombin generation (TG) and plasmin generation (PG).    Objective  To determine differences in TG and PG between HA patients before and during a pharmacokinetic study and identify best parameters to develop a pharmacodynamic model.    Methods  Twenty‐five HA patients (baseline FVIII < 1‐9 IU/dL) underwent a pharmacokinetic study with a single dose of 25‐50 IU/kg standard half‐life FVIII concentrate. At baseline and after administration of FVIII TG and PG parameters were measured with the NHA.    Results  FVIII activity level increased from median 1.0 IU/dL (interquartile range < 1.0‐6.0) to 71 IU/dL (62‐82) 15 minutes after administration and decreased to 15 IU/dL (10‐26) at 24 hours. TG was enhanced simultaneously, with thrombin peak height (TPH) increasing from 22nM (15‐35) to 222nM (159‐255), and thrombin potential (TP) from 404nM/min (undetectable‐876) to 1834nM/min (1546‐2353). Twenty‐four hours after infusion, TG parameters remained high (TPH 73nM [58.5‐126.3]; TP 1394nM/min [1066‐1677]) compared to FVIII activity level. PG showed hyperfibrinolysis in severe HA patients compared to mild patients and controls, which normalized after FVIII supplementation.    Conclusion  HA patients showed clear differences in baseline TG and PG despite having comparable FVIII activity levels. These results reveal a discrepancy between FVIII activity level and TG, in which the latter may be a better parameter to monitor individualized treatment in HA patients.

Pharmacodynamic monitoring of factor VIII replacement therapy in hemophilia A: Combining thrombin and plasmin generation