VWFAR – “Von Willebrand Act Ristocetin”

Update to specimen requirements, rejection criteria, and turnaround time

Patient Preparation: Collect using coagulation testing collection methods.

Specimen Preparation: Send 1.5 mL platelet-poor plasma in a screw capped plastic vial. CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Rejection Criteria: Serum, clotted or hemolyzed specimens, EDTA plasma

Turnaround Time: 3 – 5 days