Help Please log in to determine if you are eligible to purchase PT Programs. HUMAN EPIDIDYMIS PROTEIN 4 - HUEP 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 Human epididymis protein 4 3 Two shipments per year Program Information Three 1.0‑mL lyophilized serum specimens Shipping Information Shipment A: January 24 Shipment B: July 5 Guest Log in/Register