Special Precautions/Comments:

Additional Information:

Von Willebrand disease (VWD) is a genetic disorder caused by missing or defective von Willebrand factor (VWF), a clotting protein. VWF binds factor VIII, a key clotting protein, and platelets in blood vessel walls, which help form a platelet plug during the clotting process. Testing is used to help diagnose von Willebrand disease (VWD) and distinguish between the various types of VWD. … VWF antigen – this test measures the amount of the VWF protein present in the blood. VWF activity (also called Ristocetin Cofactor) – this test determines whether the protein is functioning properly.