WARNING: We do not support Internet Explorer. It is not secure and will not work correctly. Please come back using a newer web browser.

Access Our Free Resources

Free Microbiology Resources

CLSI Micro Free

M100, M23, M23 Supplements, M27M44S, and M45

Micro Free (formerly M100 Free) includes read-only access to critical microbiology standards. These standards are essential for better patient outcomes and reducing antimicrobial resistance. CLSI is committed to making resources broadly available to users around the globe to save lives and improve patient health.


Performance Standards for Antimicrobial Disk and Dilution Susceptibility Tests for Bacteria Isolated From Animals

Quickly reference the most trusted AST veterinary breakpoint tables as a convenient, complimentary supplement to the AST VET01 document.

CLSI AST Rationale Documents

Package of Rationale Documents

Providing the scientific reasons behind breakpoint decisions.

CLSI Using M100-Ed32

Using M100-Ed32

Improve your lab's antimicrobial susceptibility testing (AST) by using this self-paced, online learning program. This interactive program will teach you how to navigate the many tables found in CLSI's document M100Performance Standards for Antimicrobial Susceptibility Testing, 32nd Edition.


Breakpoints in Use (BPIU)

The College of American Pathologists (CAP) is introducing two new requirements for clinical laboratories to use updated breakpoints (BPs) when interpreting antimicrobial susceptibility testing (AST) results. CAP has recognized that some laboratories are using obsolete breakpoints, even when devices have achieved US Food and Drug Administration (FDA) clearance for updates, which could lead to adverse consequences in managing patients.

Free Method Evaluation Resources


A Framework for Using CLSI Documents to Evaluate Medical Laboratory Test Methods, 3rd Edition

This report introduces the Test Life Phases Model, which points users to CLSI evaluation protocol documents to establish and implement commercially manufactured or laboratory-developed test methods.


Harmonization of Symbology and Equations, 1st Edition

This report provides a standardized symbology for use throughout CLSI documents.

COVID-19 Testing Resources


Planning for Laboratory Operations During a Disaster, 1st Edition

This document provides guidance for laboratory and health care leadership for development, implementation, and sustainment of effective emergency preparedness plans (all hazards) supporting nonanalytical components of clinical and public health laboratory services that may pertain to various natural and manmade disasters. 


Design of Molecular Proficiency Testing/External Quality Assessment, 2nd Edition

This document provides guidelines for a quality proficiency testing/external quality assessment program, including reliable databases; design control in the choice of materials and measurands; good manufacturing processes; documentation procedures; complaint handling; corrective and preventive action plans; and responsive timing of reports. 


Microarrays for Diagnosis and Monitoring of Infectious Diseases, 1st Edition

This document provides guidance for the laboratory development and use of qualitative nucleic acid microarray methods for the diagnosis and monitoring of infectious diseases. It also presents recommendations for validation and verification, quality control, and interpretation of results. 


Quality Management: Approaches to Reducing Errors at the Point of Care, 1st Edition

This document presents the core infrastructure for a standardized error tracking system with the primary goals of reducing risk and increasing quality of point-of-care testing, while accumulating standardized data for benchmarking use. 


Quality System Regulations for Laboratory Developed Tests: A Practical Guide for the Laboratory

This practical guide is intended for the laboratory that is creating laboratory developed tests.

Free COVID-19 Webinars

CLSI EP07 Free Overview Webinar

EP07 Overview: Interference Testing in Clinical Chemistry

CLSI EP17 Free Overview Webinar

EP17 Overview: Evaluation of Detection Capability for Clinical Laboratory Measurement Procedures

CLSI GP41 Free Overview Webinar

Collection of Diagnostic Venous Blood Specimens

CLSI M29 Free Overview Webinar

Protection of Laboratory Workers From Occupationally Acquired Infections

CLSI MM03 Free Overview Webinar

MM03 Overview: Molecular Diagnostic Methods for Infectious Diseases

CLSI Free: POCT for COVID-19 Testing

Best Practices for Point-of-Care Implementation of COVID-19 Testing

Best Practices for Point-of-Care Implementation of COVID-19 Testing

CLSI QMS03 Free Overview Webinar

Using QMS03, Training and Competence Assessment, On-Demand Webinar

Free Recent Webinars

CLSI Rationale Webinar

FDA’s Role in ASTs and Understanding CLSI Breakpoint Decisions

Learn about the FDA’s Role in increasing the availability and reliability of ASTs and about CLSI’s commitment to ensure updated and new breakpoints are available to clinical laboratories.

CLSI On Demand: EP14 Webinar

Using EP14: Evaluation of Commutability of Processed Samples