"Quality Control for Commercially Prepared Microbiological Culture Media." Please note that this is an archived document

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: The M22-A3 revision expanded the list of media exempt from routine user quality control by 27 additional types, based on low failure rates reported in surveys. Failure Rate Threshold : It established an acceptable failure rate cutoff of

The document clarifies the distinct roles of the manufacturer, distributor, and end-user in the quality chain. Where to Find the CLSI M22-A3 PDF

One of the most significant contributions of the M22-A3 guideline is the classification of media into two categories:

: The American National Standards Institute also hosts CLSI documents for purchase. Analysis of Quality Control Standards in Microbiology 1. The Rationale for Media Quality Control

Purpose and scope

CLSI M22-A3 is a document that provides guidelines for quality control in clinical microbiology laboratories. The document outlines best practices for ensuring the accuracy and reliability of laboratory results, which is critical for patient care. The guidelines cover various aspects of quality control, including: