Overview
PCR inhibition prevents reliable amplification so target absence cannot be trusted. In result review, failed or weak internal control performance is a primary clue that a quiet target must not be reported as not detected.
Classification
| Finding | Safe call |
|---|---|
| Valid IC + no target (SOP met) | May support not detected |
| Failed/weak IC + quiet target | Invalid, not true negative |
| Partial IC failure / flags | Follow assay acceptance rules |
| Resolved after SOP action | Interpret valid repeat path only |
Morphologic Features
Not applicable, inhibition is a reaction-performance and interpretation problem, not morphology.
Laboratory Characteristics
- Always review IC before releasing not-detected results
- Specimen matrix and extraction quality influence inhibition risk
- Ct/Cq from inhibited reactions are not reliable clinical scores
Reference Intervals
Not applicable as a universal numeric interval. Acceptance and recovery actions are defined by the assay and laboratory procedure.
Clinical and Laboratory Significance
Misreporting inhibition as negative creates false reassurance. After a valid not-detected recovery, negative ≠ always exclude disease. If target later detects, positive ≠ always active disease.
Differential Considerations
Distinguish true not detected (valid IC, SOP met) from inhibition/invalid, extraction failure, and wrong specimen type. Do not collapse these into one clearance statement.
Comparison Tables
Inhibition interpretation checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| Failed IC, flat targets | Invalid, hold/recover | Release not detected for isolation exit |
| Valid not detected after recovery | Assay rules met; still has limitations | Disease absolutely excluded |
| Ct on inhibited run | Not interpretable as clinical grade | Use as infectiousness score |
Classification Frameworks
Not applicable . WHO classifications do not replace internal-control acceptance rules for PCR inhibition.
Laboratory Notes
- Controls first in the interpretation sequence
- Invalid ≠ negative; avoid unsupported clearance certainty
- Recover per SOP, then reinterpret only the valid result
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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