Help Please log in to determine if you are eligible to purchase PT Programs. ANTIFILAMENTOUS ACTIN IGG ANTIBODY - FCN 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 Antifilamentous actin (f‑actin) IgG antibody 3 Two shipments per year Program Information Three 0.5‑mL serum specimens Shipping Schedule Shipment A: April 25 Shipment B: November 7 Guest Log in/Register