Help Please log in to determine if you are eligible to purchase PT Programs. THERAPEUTIC DRUG MONITORING-EXTEND - ZE 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 Clozapine 3 Two shipments per year Gabapentin 3 Lacosamide 3 Lamotrigine 3 Levetiracetam 3 Oxcarbazepine metabolite 3 Pregabalin 3 Rufinamide 3 Teriflunomide 3 Topiramate 3 Zonisamide 3 Program Information Three 5.0‑mL serum specimens Shipping Schedule Shipment A: February 10 Shipment B: August 10 Guest Log in/Register Customers Who Bought This Item Also Bought Clinical Toxicology Testing: A Guide For Laboratory Professionals, 2nd edition VIEW DETAILS >