Overview
In the clinical microbiology laboratory, antimicrobial classes are organizational categories used to build AST panels, cascades, and reports for defined organism groups under standardized phenotypic methods.
Classification
| Concept | Bench use | Hedge |
|---|---|---|
| β-lactams, FQ, AG, etc. | Panel grouping | Exact agents are local menus |
| Interpretive category | S/I/R or local equivalent | Breakpoint source/edition |
| QC organism | Method performance check | Expected ranges are institutional |
Morphologic Features
Not a morphologic topic. Phenotypes are zone diameters or MIC endpoints read under method rules after correct inoculum and media preparation.
Laboratory Characteristics
- Organism group → correct AST menu
- 0.5 McFarland-equivalent inoculum (confirm SOP)
- Method-approved media and incubation
- Documented reading technique
- QC pass before release
Reference Intervals
QC expected ranges, breakpoint tables, and reporting dictionaries are institutional, verify the currently adopted CLSI or EUCAST edition and local SOP. Do not treat textbook reprints as live tables.
Clinical and Laboratory Significance
Valid categories support clinical decision-making. Invalid setup (wrong inoculum/media, failed QC) produces misleading categories and must not be released.
Differential Considerations
Differentiate true resistance phenotype from technical failure (inoculum error, wrong medium, misread, QC fail). Differentiate panel listing from formulary recommendation.
Comparison Tables
AST overview decision cues
| Question at bench | Laboratory answer | Avoid |
|---|---|---|
| Which agents are on the panel? | Validated menu for organism group | Inventing unvalidated agents |
| Which standard applies? | Institutionally adopted edition | Mixing CLSI and EUCAST casually |
| Can we release? | Method + QC OK | Therapy/dosing advice |
Classification Frameworks
Not applicable.
Laboratory Notes
- No treatment, dosing, or drug-selection language
- Hedge breakpoints and QC ranges as institutional
- Emphasize inoculum, media, reading, and QC on every run
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 Antibiotics Overview foundational topics Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Antibiotics Overview laboratory reference?
Antibiotics Overview is a Foundational Topics entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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