Help Please log in to determine if you are eligible to purchase PT Programs. H PYLORI ANTIGEN, STOOL - HPS Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Procedure Challenges per Shipment Number of Shipments Helicobacter pylori antigen detection 2 Two shipments per year Program Information Two 0.5‑mL fecal suspensions Shipping Schedule Shipment A: March 30 Shipment B: September 14 Guest Log in/Register