Pdf | Clsi M22a3

M22-A3 introduced several significant changes from the previous M22-A2 version based on extensive surveys by the :

Archived (meaning it is no longer being actively reviewed, but still widely used for guidelines). Revision: Replaces the previous M22-A2 standard. Format: Available in electronic/PDF format. clsi m22a3 pdf

The core premise of M22-A3 is that retesting commercially prepared media is often unnecessary if the media has a proven track record of high reliability. By analyzing failure rates from surveys conducted by the College of American Pathologists (CAP), the CLSI identified specific media types that consistently perform well. The core premise of M22-A3 is that retesting

: These are media types with higher failure rates or those used for fastidious organisms (like Chocolate Agar or Campylobacter media). Laboratories must perform full QC testing on every new lot or shipment of these media. Key Quality Control Parameters Laboratories must perform full QC testing on every

This core section details:

: Upon receipt, staff must check for physical defects like cracked plates, unequal filling, hemolysis, or visible contamination. Performance Monitoring

The standard explicitly applies to , ready-to-use microbiological culture media. It does not cover media prepared entirely in-house from raw ingredients (though those labs may still use it as a reference). Intended users include clinical labs, public health labs, veterinary diagnostics, and industrial microbiology facilities.