Patienter med heparin- induceret trombocytopeni Fondaparinux binder ikke til P- koagulationsfaktor 4, og det giver ikke krydsreaktion med sera fra patienter med heparin- induceret trombocytopeni type II (HIT II).
Patients with Heparin Induced Thrombocytopenia Fondaparinux does not bind to platelet factor 4 and does not cross-react with sera from patients with Heparin Induced Thrombocytopenia (HIT) type II.