M23 Free
This guideline discusses the necessary and recommended data for selecting appropriate breakpoints and quality control ranges for antimicrobial agents.
CLSI Microbiology Standards Subcommittees & Resources
Advancing the Field of Microbiology with Timely AST Standards
Find the latest news and updates from our microbiology standards committees.
Why Use CLSI Breakpoints? Free Resources AST Rationale Documents AST Subcommittee E-mail List
About the Microbiology Standards Subcommittees
- About CLSI's Subcommittees on Antimicrobial Susceptibility Testing (AST)
- About CLSI’s Subcommittee on Antifungal Susceptibility Tests
- About CLSI’s Subcommittee on Veterinary Antimicrobial Susceptibility Testing (VAST)
View Meeting Files and Resources
- Meeting Presentation Minutes
- M100 Resources
- Other Tools Used for Decisions
View Educational Resources
- AST News Updates
- Webinars
- Upcoming Microbiology Webinars
- Archived Microbiology Webinars
- On-Demand CLSI-SIDP ACCP Annual Webinar Note: This will open ProCE's website.
- Other
- Statistician Summary for Alternative 5X3 QC Testing
- CLSI and AST
- FDA Makes Up-to-Date Susceptibility Test Interpretive Criteria (Breakpoint) Resources Available Online Note: This will open the FDA website.
- M23 Disk Content Submission Inquiry
- Joint ASM-CLSI-CAP Individualized Quality Control Plan (IQCP) Note: This will open the ASM website.
Access Our Free Microbiology Standards Resources
VET01S Free
Quickly reference the most trusted AST veterinary breakpoint tables as a convenient, complimentary supplement to the AST VET01 document.
M100 and M60 Free
With these read-only web versions of M100 and M60, you can now quickly reference the most trusted AST and antifungal breakpoints from anywhere with an Internet connection. Available online as a convenient companion to our M100 document and M60 document.
Rationale Documents
Our rationale documents provide the scientific reasons behind the AST subcommittee’s decisions, along with documentation of the standardized data and methods used to determine breakpoints.
Volunteering With CLSI
Hear directly from our volunteers about their experience volunteering on CLSI AST Subcommittees.
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AST Meetings
Future AST Meetings
January-February 2021
Virtual
June 24–29, 2021
San Diego, California, USA
Recent AST Meetings
August-October 2020
Virtual
January 23–26, 2020
Tempe, Arizona, USA
Staff Liaison
Marcy L. Hackenbrack, MCM, M(ASCP)
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