Overview
A positive or detected molecular result means the assay's selected nucleic acid target met validated detection criteria after specimen acceptability and required controls passed. It does not by itself prove active disease, viability, or treatment need.
Classification
| Element | Positive-result focus |
|---|---|
| Analytical meaning | Target criteria met on valid run |
| Clinical meaning | Requires correlation and assay context |
| Not automatically proven | Active disease, viability, infectiousness |
| Reporting | SOP detected/positive language + limitations |
Morphologic Features
Not applicable, this entry covers molecular result interpretation, not morphologic identification.
Laboratory Characteristics
- Requires passed controls before release
- Ct/Cq is assay-specific when used
- Contamination and specificity limits still apply
Reference Intervals
Not applicable as a universal numeric interval. Detection thresholds and any Ct/Cq cutoffs are assay-defined.
Clinical and Laboratory Significance
Supports that selected target nucleic acid meeting assay criteria was present. Clinical significance depends on intended use, specimen, timing, and correlation, not on detection alone.
Differential Considerations
Before over-calling clinical disease, consider colonization, residual nucleic acid, contamination, wrong specimen context, or assay cross-reactivity rules as applicable to the procedure.
Comparison Tables
Positive-result checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| Detected | Target criteria met on valid run | Active disease proven |
| Lower Ct | Method-dependent metric | Always more severe/infectious |
| Report text | Validated terminology | Treatment mandate language |
Classification Frameworks
Not applicable . WHO disease classifications do not redefine laboratory detected/positive molecular categories.
Laboratory Notes
- Positive ≠ always active disease
- Keep limitations in the interpretation sequence
- Avoid unsupported diagnostic certainty
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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