Overview
Tuberculosis (TB) molecular testing detects selected Mycobacterium tuberculosis complex deoxyribonucleic acid (DNA) targets, and on some assays selected resistance-associated markers, in validated specimens. Results are interpreted under the assay and laboratory procedure; culture correlation is often still required.
Classification
| Application element | Focus |
|---|---|
| Clinical question | TB-complex target ± resistance markers? |
| Usual specimen | Sputum / assay-validated matrix |
| Target detected | Selected TB-complex DNA ± markers |
| Basic method | Extract → amplify/detect → controls → report |
| Role of controls | Pass before patient calls |
| Result categories | Detected / not detected / invalid (± markers) |
| Major limitations | Viability, scope, residual nucleic acid |
| Correlation | Smear, culture, phenotypic AST as required |
Morphologic Features
Not applicable, this entry covers molecular TB testing applications, not morphologic AFB identification.
Laboratory Characteristics
- Menus and methods are institutional, one commercial workflow is not universal
- Molecular detection does not always prove viable organisms
- Resistance-marker calls may not replace phenotypic antimicrobial susceptibility testing (AST)
Reference Intervals
Not a universal numeric interval. Qualitative detection and any marker calls are assay-specific. Follow the validated procedure.
Clinical and Laboratory Significance
Supports rapid selected-target TB-complex detection and, when offered, selected resistance-marker reporting. Trustworthiness depends on specimen quality, assay scope, valid controls, and needed culture or AST correlation.
Differential Considerations
Before over-interpreting 'detected,' consider residual nucleic acid, assay specificity limits, and the ongoing need for culture. Before over-interpreting 'not detected,' consider wrong specimen, inhibition, invalid controls, or organisms outside assay claims (including many nontuberculous mycobacteria).
Comparison Tables
TB molecular checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| TB molecular positive | Selected TB-complex target detected under valid conditions | Always viable organisms / workup finished |
| Resistance marker | Selected gene target per assay claims | Always replaces phenotypic AST |
| Culture | Often still required for pathway completion | Molecular result cancels culture always |
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
- Culture correlation often still needed
- 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
Common questions about using this Tuberculosis Molecular Testing additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Tuberculosis Molecular Testing laboratory reference?
Tuberculosis Molecular Testing is a Additional Test References entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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