Costak Cardiothoracic Vascular Surgery

Boston Children's in Weymouth, MA has always embodied a culture of innovation and scientific discovery, with the goal of improving the lives of children and families. This legacy continues today as we lead the world in pediatric research, empowering our clinicians and scientists to challenge the status quo and seek better answers for children everywhere.

Hemophilia is an inherited bleeding disorder in which the blood does not clot normally because of a missing or dysfunctional clotting protein. Clotting proteins, also called clotting factors, work with other blood components such as platelets, von Willebrand factor, and other proteins to form a blood clot. When any of these components is absent or low, increased bleeding can result. If clotting factor VIII (8) or factor IX (9) are affected, this bleeding disorder is called hemophilia.