Help Please log in to determine if you are eligible to purchase PT Programs. RED BLOOD CELL FOLATE - FOL 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 RBC folate 2 Three shipments per year Program Information Two 2.0‑mL lyophilized whole blood specimens Conventional and International System of Units (SI) reporting offered Shipping Schedule Shipment A: April 4 Shipment B: July 18 Shipment C: November 7 Guest Log in/Register