Welcome Help Please log in to determine if you are eligible to purchase PT Programs. RIVAROXABAN ANTICOAGULANT MONITORING - RVBN Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Analyte Challenges per Shipment Number of Shipments Activated partial thromboplastin time* 3 Two shipments per year Prothrombin time* 3 Rivaroxaban 3 *Not appropriate for meeting regulatory requirements. Program Information Three 1.0‑mL lyophilized plasma specimens Shipping Schedule Shipment A: April 11 Shipment B: October 23 Guest Log in/Register Customers Who Bought This Item Also Bought DABIGATRAN ANTICOAGULANT MONITORING VIEW DETAILS > FONDAPARINUX ANTICOAGULANT MONITORING VIEW DETAILS >