Help Please log in to determine if you are eligible to purchase PT Programs. VIROLOGY ANTIGEN DETECTION (NON-DFA) - VR4 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 Adenovirus (Not 40/41) antigen 5 Three shipments per year Influenza A antigen 5 Influenza B antigen 5 Respiratory syncytial virus (RSV) antigen 5 Rotavirus antigen 5 Program Information Five 1.5‑mL specimens For use with enzyme immunoassay and/or latex agglutination methods Shipping Schedule Shipment A: February 3 Shipment B: May 4 Shipment C: November 9 Guest Log in/Register