TEST CATALOG ORDERING & RESULTS SPECIMEN HANDLING CUSTOMER SERVICE EDUCATION & INSIGHTS
Test Catalog

Test ID: VWACT    
von Willebrand Factor Activity, Plasma

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

Diagnosis of von Willebrand disease (VWD) and differentiation of VWD subtypes or differentiation of VWD from hemophilia A

 

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

Reflex Tests Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial tests.

Test IDReporting NameAvailable SeparatelyAlways Performed
RISTRistocetin Cofactor, PNoNo

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

If von Willebrand factor activity is less than 55%, then the von Willebrand factor ristocetin cofactor activity assay will be performed at an additional charge.

Special Instructions Library of PDFs including pertinent information and forms related to the test

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

Latex Immunoassay (LIA)

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

Yes

Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

von Willebrand Factor Activity, P

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

Ristocetin cofactor
VFW Activity
Von Willeband factor activity
TEST