What is von Willebrand Factor?
Certain proteins in your blood help the blood to clot. Von Willebrand factor is one of those proteins. It is made by the lining of cells in the wall of blood vessels (veins and arteries). When blood vessels are damaged, platelets (small blood cells that collect and stick together to plug cuts and breaks in blood vessels) clump together at the site of the injury. Von Willebrand factor acts like glue that helps the platelets stick together. Von Willebrand factor is also a carrier of clotting factor VIII, another protein that helps your blood to clot.