Help Please log in to determine if you are eligible to purchase PT Programs. VIRAL MARKERS-SERIES 4 - VM4 Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Analyte Challenges/Shipment Number of Shipments Anti‑Trypanosoma cruzi (Chagas disease) 2 Two shipments per year Program Information Two 1.0‑mL plasma specimens Shipping Schedule Shipment A: January 17 Shipment B: May 9 Guest Log in/Register