The International Society on Thrombosis and Haemostasis (ISTH) is the leading worldwide organization dedicated to the advancement of the understanding, prevention, diagnosis and treatment of thrombotic and bleeding disorders. ISTH is an international professional individual membership organization with over 4,000 members in more than 95 countries around the world. Among its highly regarded activities and initiatives are education and standardization programs, research activities, meetings and conferences, peer-reviewed publications, expert committees and World Thrombosis Day (www.worldthrombosisday.org). Learn more about the Society at www.isth.org.