von Willebrand Factor Antigen, PlasmaPrint this page
Updated Test Information:
von Willebrand Factor Antigen, Plasma
von Willebrand Factor Ag
Diagnosis of von Willebrand disease (VWD) and differentiation of VWD subtype (in conjunction with von Willebrand factor ristocetin cofactor activity and factor VIII coagulant activity)
Differentiation of VWD from hemophilia A (in conjunction with factor VIII coagulant assay)
Monitoring therapeutic efficacy of treatment with DDAVP (desmopressin) or von Willebrand factor (VWF) concentrates in patients with VWD
Frozen 14 days
|Unacceptable Specimen Conditions||
Gross hemolysis Reject
Gross lipemia Reject
Gross icterus Reject
Latex Immunoassay (LIA)
|Minimum Sample Volume||
Note: Individuals of blood group "O" may have lower plasma von Willebrand factor (VWF) antigen than those of other ABO blood groups, such that apparently normal individuals of blood group "O" may have plasma VWF antigen as low as 40% to 50%, whereas the lower limit of the reference range for individuals of other blood groups may be 60% to 70%.
Children: Neonates, infants, and children have normal or mildly increased plasma VWF antigen, with respect to the adult reference range.