CLSI M22-A3 is the third edition of the approved standard that establishes responsibilities and practical protocols for both manufacturers and end-user laboratories regarding the QC of commercially prepared media.
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Microbiology laboratories historically performed full, rigorous QC testing on every single batch of media received, regardless of the manufacturer's internal testing. Recognizing that modern commercial manufacturing processes are highly controlled and reliable, CLSI introduced the M22 standard to reduce unnecessary, redundant testing while maintaining strict patient safety standards. The Core Philosophy: Exempt vs. Non-Exempt Media
It defines the exact documentation commercial manufacturers must provide to end-users to guarantee compliance. Exempt vs. Non-Exempt Media CLSI M22-A3 is the third edition of the
Examine the media for physical defects such as freezing, cracking, bubbles, hemolysis, contamination, or incorrect volume/depth.
CLSI M22-A3 is the Clinical and Laboratory Standards Institute guideline titled "Methods for Antimicrobial Disk Susceptibility Testing of Bacteria Isolated from Animals" (3rd edition). It provides standardized procedures, interpretive criteria, quality control recommendations, and reporting guidance for disk diffusion antimicrobial susceptibility testing in veterinary microbiology. quality control recommendations
Below is an in-depth look at what the M22A3 standard entails, its key components, and why it remains a fundamental document in clinical microbiology. The Purpose and Scope of M22A3
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