The National Blood Clot Alliance (NBCA) is a patient-led, voluntary health advocacy organization. NBCA volunteers include many of the nation's foremost experts on blood clots and blood clotting disorders. NBCA programs include patient education and professional training on the signs, symptoms and prevention of blood clots and clotting disorders. The mission of the National Blood Clot Alliance is to prevent, diagnose and treat thrombosis and thrombophilia through research, education, support and advocacy.