How can we help you? Availability of treatments may vary from country to country. Please be sure to visit your local CSLBehring.com site for further information. von Willebrand Disease Von Willebrand Disease (VWD) is a bleeding disorder caused by a deficiency of a protein called von Willebrand Factor. Product websites include: Humate-P.com (United States) Hemophilia A Hemophilia A is a bleeding disorder caused by a deficiency in blood clotting Factor VIII. Product websites include: AFSTYLA.com (United States) Humate-P.com (United States) Beriate.de (Germany) Hemophilia B Hemophilia B is a bleeding disorder caused by a deficiency in blood clotting Factor IX. Product websites include: IDELVION.com (United States) Factor XIII Deficiency Congenital factor XIII deficiency is a bleeding disorder characterized by unstable blood clots. Factor X Deficiency (Available in Switzerland Only) Factor X deficiency is a bleeding disorder that can be both inherited or acquired. Fibrinogen Deficiency Congenital fibrinogen deficiency describes a range of conditions characterized by absent, insufficient or dysfunctional fibrinogen.