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In-vitro diagnostic automated assay for the quantitative determination of the von Willebrand factor-GPIb-binding activity in human plasma collected from venous blood samples in 3.2% sodium citrate tubes on the BCS XP System. As an aid used in the evaluation of patients with suspected or confirmed von Willebrand factor disorders. Results of this test should always be interpreted in conjunction with the patient's medical history, clinical presentation and other laboratory findings.

The INNOVANCE VWF Ac assay is a particle enhanced turbidimetric assay based on binding of VWF to the recombinant GPIb (two gain-of-function mutations included). The assay provides quantitative VWF activity results on 3.2% citrated human plasma when used with Standard Human Plasma Calibrators (K023141). The reagent kit consists of three components: Reagent I (containing polystyrene particles coated with anti-GPIb mouse monoclonal antibodies). Reagent II (buffer containing heterophilic blocking reagent) and Reagent III (containing recombinant GPIb).