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Medical laboratories use CLSI M45 to determine how atypical bacteria respond to various antimicrobial agents. Because these organisms often have unique growth requirements or slow growth rates, standard testing media and incubation conditions fail to yield accurate results. CLSI M45 establishes customized boundaries to ensure testing accuracy and clinical relevance. Why is CLSI M45 Essential for Clinical Laboratories? clsi document m45 pdf
Laboratory staff should review the "notes" section in the tables, as they often contain critical information regarding specific organism-drug pairings. www.nih.org.pk This public link is valid for 7 days
CLSI M45, titled "Methods for Antimicrobial Dilution and Disk Susceptibility Testing of Infrequently Isolated or Fastidious Bacteria," provides specific, actionable guidance for laboratories evaluating organisms that do not have established testing criteria in the standard CLSI M100 document. Can’t copy the link right now
Fastidious bacteria often grow poorly on standard Mueller-Hinton agar. If a lab attempts to test them using standard methods, the lack of growth might be misinterpreted as susceptibility, or poor growth might mask true resistance. M45 defines modified media (such as Mueller-Hinton broth with lysed horse blood) to ensure robust growth. Preventing Therapeutic Failure