Test ID: RIST
Ristocetin Cofactor, Plasma
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
Useful For Suggests clinical disorders or settings where the test may be helpful
von Willebrand factor (VWF) ristocetin cofactor activity measurement is most effective when it is combined with measurement of VWF antigen, and factor VIII coagulant activity, preferably as a panel of tests with reflexive testing and interpretive reporting (eg, VWPR/83099 von Willebrand Profile). Measurement of VWF ristocetin cofactor activity, only, has limited diagnostic value.
Within this context, VWF ristocetin cofactor activity 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
Ristocetin Induced Agglutination of Washed Normal Platelets
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
Aliases Lists additional common names for a test, as an aid in searching
Von Willebrand Factor Activity
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