Clsi — M22a3 Pdf Link [top]

The standard sets a clear cutoff for an acceptable failure rate at ≤0.5% , meaning no more than 5 out of 1000 units should demonstrate random defects.

: Provides options for both hardcopy and PDF formats. Free Related Resources

: Provides the 2018 reaffirmed version (R2018) in digital format.

. In the CLSI system, archived standards are no longer reviewed through the consensus process but remain available for reference. Clinical & Laboratory Standards Institute | CLSI Key Updates in M22-A3

Retailers like Accuris also provide the document, often noting it as CLSI M22-A3 (R2018) to reflect its most recent reaffirmation. Implementation in Modern Labs clsi m22a3 pdf link

You can purchase the PDF download or a print copy directly from the official CLSI website.

CLSI standards are widely adopted by clinical laboratories, manufacturers, and regulatory bodies such as the U.S. Food and Drug Administration (FDA) and the Centers for Medicare & Medicaid Services (CMS).

PDF link (official source): https://clsi.org/standards/products/microbiology/documents/m22/

, the Centers for Medicare & Medicaid Services (CMS) changed the regulatory landscape for media quality control in the United States. CMS no longer recognizes the "exempt" and "nonexempt" categories established in M22-A3 for the purposes of quality control. Instead, clinical laboratories subject to the Clinical Laboratory Improvement Amendments of 1988 (CLIA) must either: The standard sets a clear cutoff for an

Many hospital networks, university libraries, and reference laboratories maintain site-wide subscriptions to the CLSI eClipse platform, giving employees free access through their institution.

. It provides guidelines for manufacturers, distributors, and users to ensure the reliability and consistency of culture media used in clinical laboratories. Clinical & Laboratory Standards Institute | CLSI Official Document Details

CLSI M22-A3 is a globally recognized consensus standard. It establishes responsibilities for both manufacturers and laboratory users regarding the quality control of commercially prepared media.

Offers the PDF version with electronic download capabilities. Implementation in Modern Labs You can purchase the

Since January 2016, US labs subject to CLIA regulations often move toward Individualized Quality Control Plans (IQCP), but M22-A3 remains a technically valid and valuable resource in the CLSI library. Why Standards Matter in 2026 Even as we look toward 2026 CLSI guidelines

Ensure proper storage conditions (temperature and humidity control).

or trying to understand how it impacts your lab’s daily workflow, this post covers the essentials. What is CLSI M22-A3?

In conclusion, the CLSI M22-A3 guideline is a cornerstone of modern laboratory practice. It balances the need for absolute diagnostic accuracy with the practicalities of laboratory management. By providing a clear roadmap for media exemption and quality maintenance, M22-A3 empowers clinical laboratories to operate more efficiently without compromising the integrity of microbiological results. As regulatory bodies continue to emphasize evidence-based quality control, the principles laid out in M22-A3 remain as relevant today as they were at the time of the document’s publication.

Practical recommendations for laboratorians

Note: CLSI standards are copyrighted materials and must be purchased from authorized sources.