Overview
In clinical molecular testing, a gene is the named region a test is “about,” a target is the exact sequence the assay is validated to amplify and detect, and a mutation is a sequence change from the expected wild-type sequence at that target.
Classification
| Term | What it means for testing | Example |
|---|---|---|
| Gene | Named locating region | BRAF |
| Target | Exact sequence the assay detects | BRAF codon 600 |
| Mutation | Sequence change from wild-type | V600E variant |
Morphologic Features
Not applicable, gene, target, and mutation are sequence-level concepts, not morphologic findings.
Laboratory Characteristics
- Single-target (hotspot) assays cover one defined mutation site
- Multi-target or panel assays cover a defined, still limited, set of sites
- Sequencing-based methods can cover larger regions per their own validation
Reference Intervals
There is no numeric reference range for mutation testing. Results are reported as detected, not detected, or indeterminate for the specific validated target(s), verify exact result wording against the assay's package insert and institutional policy.
Clinical and Laboratory Significance
Detecting a specific mutation at a validated target can support diagnosis, prognosis, or therapy selection (e.g., BRAF V600E status informing melanoma treatment decisions). Clinical use of any specific mutation result should be confirmed against current guidance and the ordering specialty's protocol.
Differential Considerations
Before treating a “not detected” result as definitive, confirm the assay's validated target coverage, specimen adequacy, and whether the method's limit of detection was met, a true wild-type result differs from an inconclusive or below-threshold result.
Comparison Tables
Single-target vs broader coverage
| Feature | Single-target assay | Panel/sequencing assay |
|---|---|---|
| Coverage | One defined mutation site | Multiple defined sites or a larger region |
| Turnaround | Typically faster | Often longer, more complex analysis |
| Negative result meaning | No variant at that one site | No variant at covered sites only |
Classification Frameworks
WHO disease classification frameworks are not the primary reference for gene/target/mutation testing terminology at this foundational level.
Laboratory Notes
- Verify exact target coverage in the assay's intended-use statement before reporting
- Use the validated result language from the assay package insert, not generalized gene-level wording
- Escalate requests for targets outside the current validated menu to the laboratory director/pathologist
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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