Proficiency Testing/EQA / 2024 Surveys / New Programs Help Please log in to determine if you are eligible to purchase PT Programs. SARS-COV-2 ANTIGEN, 5 CHALLENGE - CVAG 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 SARS-CoV-2 antigen 5 Three shipments per year Program Information Five 0.5‐mL simulated respiratory specimens Designed for antigen test Shipping Schedule Shipment A: February 12 Shipment B: May 20 Shipment B: November 25 Guest Log in/Register