Proficiency Testing/EQA / 2024 Surveys / Immunology and Flow Cytometry / Flow Cytometry Help Please log in to determine if you are eligible to purchase PT Programs. FLOW CYTOMETRY, CD34+ - FL4 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 CD34+ 2 Two shipments per year Program Information Two 1.5‑mL stabilized human CD34+ specimens Shipping Schedule Shipment A: April 8 Shipment B: October 14 Guest Log in/Register Customers Who Bought This Item Also Bought Color Atlas of Flow Cytometry VIEW DETAILS >