71f61991_Bleeding_Disorders__Measures
[Test] von Willebrand Factor (VWF) Antigen (VWF: Ag) [Ordered when/to] Done together with VWF activity test (e.g. as measured by Ristocetin Cofactor); evaluate bleeding episodes [Abnormal results may indicate] If low, may indicate von Willebrand disease, increased risk of bleeding [Measures] 
Quantitative measure of VWF
Bleeding Disorders
Measures