Coagulation
Von Willebrand Factor Ristocetin Cofactor Activity (vWF:RCo/Ag)
About
Measures von Willebrand factor ristocetin cofactor activity, assessing its function in von Willebrand disease.
Preparation
Do not eat for 4 hours before the test; still water is allowed. Plasma samples must be taken before any plasma transfusion or plasma exchange.