Overview
Antimicrobial resistance gene detection identifies selected resistance-associated nucleic acid targets in validated specimens, culture material, or isolates. A gene call is a molecular finding and may not replace phenotypic antimicrobial susceptibility testing (AST) in every situation.
Classification
| Application element | Focus |
|---|---|
| Clinical question | Selected resistance gene detected? |
| Usual specimen | Validated specimen / culture / isolate |
| Target detected | Selected resistance-associated nucleic acid |
| Basic method | Extract → amplify/detect → controls → report |
| Role of controls | Pass before patient gene calls |
| Result categories | Detected / not detected / invalid |
| Major limitations | Silent genes, uncovered mechanisms, scope |
| Correlation | Culture ID and phenotypic AST as required |
Morphologic Features
Not applicable, this entry covers molecular resistance-gene testing, not morphologic identification.
Laboratory Characteristics
- Menus and methods are institutional, one commercial workflow is not universal
- Gene detection is not automatically full phenotypic resistance for every drug
- Absence of a gene does not prove full susceptibility to all agents
Reference Intervals
Not a universal numeric interval. Qualitative gene calls are assay-specific. Follow the validated procedure.
Clinical and Laboratory Significance
Supports rapid selected resistance-marker detection within assay claims. Trustworthiness depends on specimen quality, assay scope, valid controls, and needed correlation with culture and phenotypic AST.
Differential Considerations
Before over-interpreting 'gene detected,' consider assay specificity and whether phenotype is still required. Before over-interpreting 'not detected,' consider inhibition, invalid controls, wrong specimen, or resistance mechanisms outside the menu.
Comparison Tables
Resistance-gene checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| Gene detected | Selected resistance target present under valid conditions | Always finished phenotypic AST / all related drugs resistant |
| Gene not detected | Selected target not found on this assay | Organism fully susceptible to everything |
| Phenotypic AST | Often still required per pathway | Molecular gene call always replaces AST |
Classification Frameworks
Not applicable as a World Health Organization (WHO) disease classification entry, this is a laboratory application overview.
Laboratory Notes
- Frame every order: question, specimen, target, method, controls, results, limitations, correlation
- Resistance gene may not replace phenotypic AST in every situation
- Do not give treatment recommendations from laboratory training content
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
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021. (Molecular diagnostics chapters, verify current edition.)
- Buckingham L. Molecular Diagnostics: Fundamentals, Methods, and Clinical Applications. 3rd ed. F.A. Davis; 2019. (Verify current edition.)
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute (CLSI). Consult current CLSI molecular method documents available through your laboratory, document numbers and editions change; do not treat any single CLSI title as universal.
- Institutional molecular laboratory SOPs, assay manufacturer instructions for use (IFU), and locally adopted accreditation requirements. Always verify current local practice.
Frequently Asked Questions
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