Proficiency Testing/EQA / 2024 Surveys / Coagulation Help Please log in to determine if you are eligible to purchase PT Programs. VON WILLEBRAND FACTOR - CGS3 Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Module/Analyte Challenges per Shipment Number of Shipments Activated partial thromboplastin time* 2 Two shipments per year von Willebrand Factor Module Factor VIII assay 2 von Willebrand factor (antigen, activity, multimers) 2 Factor VIII inhibitor 2 *Not appropriate for meeting regulatory requirements. Program Information Two 2.0‑mL of lyophilized plasma specimens Shipping Schedule Shipment A: March 11 Shipment B: August 26 Guest Log in/Register Customers Who Bought This Item Also Bought VON WILLEBRAND FACTOR ANTIGEN CVL VIEW DETAILS > EXPANDED COAGULATION FACTORS VIEW DETAILS >