Women with VWD have levels of blood clotting factor VIII (FVIII), von Willebrand factor (VWF:Ag), and von Willebrand factor ristocetin cofactor activity (VWF:RCo) measured at the time of delivery or at least two weeks before expected delivery, and more frequently if complications occur. Here, F8 is linked to von Willebrand disease (hereditary or acquired).