www.rarecoagulationdisorders.org is a dynamic, open-access website developed through a collaboration of the international RBDD Registry, the Indiana Hemophilia & Thrombosis Center, and the Rare Coagulation Disorders Subcommittee of the National Hemophilia Foundation (NHF). Resource Room provides current and searchable information on the basic science, clinical management, available laboratory and genetic testing, clinical trials, and global research initiatives for these very rare and heterogeneous coagulation disorders.