A: EUCAST does not have equivalent guidance for most of these rare organisms. CLSI M45 remains the international reference.
The guidelines emphasize broth microdilution or agar disk diffusion, offering specific incubation time and temperature recommendations for each group. How to Access and Use CLSI M45-Ed3
Verify if the organism is covered under the M45 guidelines.
CLSI has moved toward a . The CLSI document M45 PDF now includes interactive tables, hyperlinked references, and an XML data export option for laboratory information systems. Future editions may integrate directly with laboratory middleware. clsi document m45 pdf
The CLSI M45 document is updated periodically to reflect emerging resistance data and newly approved antimicrobial agents. Authorized Acquisition
CLSI M45 is a specialized guideline that serves as a crucial supplement to the CLSI's more comprehensive standards for antimicrobial susceptibility testing (AST). While documents like (Performance Standards for Antimicrobial Susceptibility Testing) cover the most common pathogens, M45 is designed specifically for bacteria that are either infrequently isolated in routine clinical practice or are fastidious , meaning they have complex nutritional requirements that make them difficult to grow and test using standard methods. The primary goal is to offer recommendations for standardized testing , including instructions for antimicrobial agent selection, test interpretation, and quality control, thereby ensuring consistency and reliability even for these challenging organisms.
Let’s break down what you will actually find in the tables and text. A: EUCAST does not have equivalent guidance for
The document covers:
: Specialized advice on drug selection, incubation environments (e.g., increased CO2cap C cap O sub 2 ), and quality control (QC) procedures. Organisms Covered in CLSI M45
: Tentative guidance for certain potential agents, as seen in the CLSI AST Newsletter . Current Edition and Availability How to Access and Use CLSI M45-Ed3 Verify
Use of Mueller-Hinton agar supplemented with sheep blood, lysed horse blood, or specific growth factors.
Each organism section provides specific recommendations for:
Implementing CLSI M45 guidelines is critical for several patient-care and operational reasons:
By doing so, you protect your patients, your laboratory’s accreditation, and your professional reputation.
