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 11 Shipment B: October 17 Guest Log in/Register Customers Who Bought This Item Also Bought Flow Cytometry in Evaluation of Hematopoietic Neoplasms: A Case-Based Approach VIEW DETAILS >