Proficiency Testing/EQA / 2024 Surveys / Toxicology Help Please log in to determine if you are eligible to purchase PT Programs. TRACE METALS - R 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 Aluminum 3 Two shipments per year Chromium 3 Copper 3 Manganese 3 Selenium 3 Zinc 3 Program Information Three 6.0‑mL liquid serum specimens Conventional and International System of Units (SI) reporting offered Shipping Schedule Shipment A: March 25 Shipment B: October 21 Guest Log in/Register