Used in diagnostic assays to detect and quantify von Willebrand factor (vWF) in blood samples, aiding in the diagnosis of von Willebrand disease and other bleeding disorders. Employed in research settings to study vWF structure, function, and its role in hemostasis and thrombosis. Serves as a reference standard in immunoassays and ELISA kits to ensure accuracy and consistency across laboratories. Also utilized in therapeutic monitoring to assess vWF levels in patients receiving replacement therapy.