Help Please log in to determine if you are eligible to purchase PT Programs. VIROLOGY CULTURE - VR1 Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Procedure Challenges per Shipment Number of Shipments Chlamydia trachomatis culture 1 Three shipments per year Viral isolation/identification 5 Program Information Five 0.5‑mL specimens for viral culture and one 0.5‑mL specimen for Chlamydia trachomatis culture Shipping Schedule Shipment A: January 27 Shipment B: May 18 Shipment C: September 21 Guest Log in/Register