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Proficiency Testing/EQA / 2025 Surveys / Microbiology /
Bacteriology

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C DIFF, 5 CHALLENGE - CDF5
CDF5
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
Clostridioides (Clostridium) difficile antigen/toxin 5 Three shipments per year

Program Information

  • Five 0.5‑mL lyophilized specimens, for use with rapid or molecular testing methods

Shipping Schedule

  • Shipment A: April 14
  • Shipment B: August 4
  • Shipment C: December 8






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