Overview
CLSI AST standards are consensus laboratory documents that, when institutionally adopted, guide antimicrobial susceptibility testing methods and the mapping of zones or MICs to interpretive categories. They are not automatic global law and are not dosing manuals.
Classification
| Layer | Example focus | Verify |
|---|---|---|
| Method | Disk / dilution performance | SOP cites adopted edition |
| Breakpoints | Zone/MIC category tables | Same edition on instruments |
| QC | Control strains/ranges | Ranges from adopted source |
| Scope notes | Organism–drug exclusions | No improvised criteria |
Morphologic Features
CLSI documents do not replace colony purity or identification congruence. Breakpoints apply to valid measurements from correctly identified isolates.
Laboratory Characteristics
- Controlled document citation (name + edition)
- Instrument/LIS breakpoint-file alignment
- Training limited to adopted edition
- Change control when editions update
Reference Intervals
Numeric breakpoints and QC ranges in CLSI tables change across editions. Do not treat any printed cutoff in educational materials as current for a given laboratory, verify institutional adoption and controlled documents. If the laboratory adopts EUCAST instead, CLSI numeric tables are not the live source.
Clinical and Laboratory Significance
Correct CLSI use (when adopted) produces categories that mean what the institution declares they mean. Edition mismatch silently changes meaning for unchanged measurements.
Differential Considerations
When categories disagree between sources, differentiate edition mismatch, CLSI-vs-EUCAST mix-ups, method error, and organism–drug pairs lacking criteria, before releasing a category.
Comparison Tables
CLSI verification checklist
| Question | Pass | Fail |
|---|---|---|
| Is CLSI adopted here? | Documented institutional adoption | Assumed because “common” |
| Which edition? | SOP + instrument match | Random teaching PDF |
| Pair has criteria? | Row exists in adopted tables | Improvised cutoff |
| Therapy from table? | No, report categories/MICs only | Drug/dose advice |
Classification Frameworks
Not applicable.
Laboratory Notes
- Strongly hedge: verify CLSI vs EUCAST institutional adoption
- Never present breakpoints as universal dogma
- No treatment or dosing language
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
Frequently Asked Questions
Common questions about using this CLSI Standards foundational topics Medical Laboratory Library reference in Medical Laboratory Science education.
What is the CLSI Standards laboratory reference?
CLSI Standards is a Foundational Topics entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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Can reference details vary between laboratories?
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