Overview
A negative or not-detected molecular result means the selected nucleic acid target did not meet validated detection criteria after specimen acceptability and required controls passed. It does not always exclude disease.
Classification
| Situation | Safe category |
|---|---|
| Controls pass; target criteria not met | Valid not detected |
| Controls fail; targets blank | Invalid, not a negative |
| Assay-defined unresolved pattern | Inconclusive per SOP |
Morphologic Features
Not applicable, this entry covers molecular result interpretation, not morphologic identification.
Laboratory Characteristics
- Internal/process control must support a not-detected call when required
- Assay menu limits which targets are ruled out
- Avoid absolute exclusion wording in LIS comments unless SOP-authorized
Reference Intervals
Not applicable as a universal numeric interval. Detection limits are assay-defined; a not-detected call is not a numeric zero with unlimited clinical certainty.
Clinical and Laboratory Significance
Supports that the selected target was not detected under tested conditions. Clinical exclusion depends on pretest probability, timing, specimen quality, and assay intended use.
Differential Considerations
Before accepting clinical exclusion, consider early/late collection, wrong specimen, inhibition/invalid controls, targets outside the assay menu, and low-level target below detection.
Comparison Tables
Negative-result checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| Not detected | Target criteria not met on valid run | Disease completely excluded |
| Failed IC + blank | Often invalid, follow SOP | Report negative |
| Assay scope | Only selected targets assessed | All similar diseases ruled out |
Classification Frameworks
Not applicable . WHO disease classifications do not redefine laboratory not-detected molecular categories.
Laboratory Notes
- Negative ≠ always exclude disease
- Invalid ≠ negative
- Keep limitations and correlation in the sequence
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.
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