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Proficiency Testing/EQA / 2025 Surveys / Microbiology /
Bacteriology

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C DIFF, 2 CHALLENGE - CDF2
CDF2
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 2 Two shipments per year

Program Information

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

Shipping Schedule

  • Shipment A: April 14
  • Shipment C: December 8






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