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Test ID: VWAG    
von Willebrand Factor Antigen, Plasma

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NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.


Useful For Suggests clinical disorders or settings where the test may be helpful

von Willebrand factor (VWF) antigen measurement is most effective when it is combined with measurement of VWF ristocetin cofactor activity and factor VIII coagulant activity, preferably as a panel of tests with reflexive testing and interpretive reporting. Within this context, VWF antigen measurement can be useful for:

-Diagnosis of von Willebrand disease (VWD) and differentiation of VWD subtype

-Differentiation of VWD from hemophilia A (in conjunction with factor VIII coagulant assay)


Monitoring therapeutic efficacy of treatment with DDAVP (desmopressin) or VWF concentrates in patients with VWD

Special Instructions and Forms Describes specimen collection and preparation information, test algorithms, and other information pertinent to test. Also includes pertinent information and consent forms to be used when requesting a particular test

Method Name A short description of the method used to perform the test

Automated Latex Immunoassay (LIA)

Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name

von Willebrand Factor Ag, P

Aliases Lists additional common names for a test, as an aid in searching

Von Willebrand Ag - Off hours 399