Proficiency Testing/EQA / 2024 Surveys / Endocrinology Help Please log in to determine if you are eligible to purchase PT Programs. BONE AND MINERAL METABOLISM, URINE - BU 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 Creatinine 2 Two shipments per year Deoxypyridinoline (DPD) 2 N‑telopeptide (NTx) 2 Program Information Two 2.0‑mL lyophilized human urine specimens Conventional and International System of Units (SI) reporting offered Shipping Schedule Shipment A: May 20 Shipment B: September 16 Guest Log in/Register