Help Please log in to determine if you are eligible to purchase PT Programs. SARS-COV-2 ANTIGEN - COVAG 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 3 Two shipments per year Program Information Three 0.5‐mL simulated respiratory specimens Designed for antigen test Shipping Schedule Shipment A: April 11 Shipment B: October 3 Guest Log in/Register