Access Our Free Resources

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.

CLSI VET01S

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 M100—Performance Standards for Antimicrobial Susceptibility Testing, 32nd Edition.

CLSI

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.

CLSI Breakpoint Implementation Toolkit

Breakpoint Implementation Toolkit

Together CLSI, Association of Public Health Laboratories (APHL), American Society for Microbiology (ASM), College of American Pathologists (CAP), and Centers for Disease Control and Prevention (CDC), have jointly developed this Breakpoint Implementation Toolkit (BIT) to assist clinical laboratories in updating minimal inhibitory concentration (MIC) breakpoints.