Proficiency Testing/EQA / Transfusion Medicine Viral Markers and Parentage Testing / Transfusion Medicine Help Please log in to determine if you are eligible to purchase PT Programs. PLATELET SEROLOGY - PS Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Procedure Challenges/Shipment Number of Shipments Antibody detection 3 Two shipments per year Platelet crossmatch 3 Platelet antibody identification 3 A low concentration of sodium azide may be present in the specimens and may affect lymphocytotoxicity methods. Program Information Three 3.0‑mL plasma specimens For use with solid‑phase red cell adherence, flow cytometry, and EIA/ELISA methods Shipping Schedule Shipment A: March 13 Shipment B: October 16 Guest Log in/Register