Rare Bleeding Disorder Database (RBDD) - A network of the hemophilia centres around the world by International Society of Thrombosis and Haemostasis. Bleeding Disorders - Provides an overview of the acquired or inherited tendency to bleed excessively, and information on the different causes and the tests available for their diagnosis and monitoring. Protein S Deficiency and Thrombophilia - Information about these rare medical conditions, anticoagulant therapy, research and online forum. MedlinePlus: Factor V Deficiency - Provides brief information about this inherited bleeding disorder, which is similar to hemophilia. Includes causes, symptoms, and prognosis. MedlinePlus: Congenital Protein C or S Deficiency - Brief information about these hypercoagulability disorders including causes, treatment, and prognosis. MedlinePlus: Factor X Deficiency - Information about this inherited disorder that causes abnormal bleeding including causes, treatment, and prognosis. MedlinePlus: Factor VII Deficiency - Brief information about this inherited bleeding disorder including causes, symptoms, and prognosis. MedlinePlus: Factor XII Deficiency - Also known as Hageman factor, this is a congenital coagulation disorder that causes prolonged coagulation in a test tube but does not cause abnormal bleeding. Includes brief information.