Antithrombin deficiency is an inherited disorder (present at birth) and significantly increases the chance of the development of abnormal blood clots. Approximately half of those with this blood disorder will develop at least one abnormal blood clot, usually after adolescence. These blood clots may cause deep vein thrombosis or pulmonary embolism.

For more information on antithrombin deficiency or to schedule an appointment with a pediatric hematologist, call St. Louis Children's Hospital at 314.454.5437 or 800.678.5437 or email us.