Overview
PCR inhibition is reduced or failed amplification that prevents reliable target detection. In clinical review, failed or weak internal control performance is a primary clue that a quiet target must not be reported as a true negative.
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 / assay flags | Follow assay acceptance rules |
| Resolved after SOP action | Reinterpret on the valid repeat path |
Morphologic Features
Not applicable, inhibition is a reaction-performance problem, not a morphologic diagnosis.
Laboratory Characteristics
- Always review IC before releasing not-detected results
- Specimen matrix and extraction quality influence inhibition risk
- Assay SOP defines allowed recovery actions
Reference Intervals
Not applicable as a patient reference interval. IC acceptance limits are assay-specific.
Clinical and Laboratory Significance
Unrecognized inhibition can produce false-negative reports that alter isolation, therapy, or public-health decisions. Invalidating the result is the safer patient action.
Differential Considerations
Quiet target differential includes true absence, inhibition, extraction failure, reagent/setup error, and instrument problems, use controls and SOP to separate them.
Comparison Tables
Inhibition interpretation guardrails
| Situation | Unsafe framing | Safe framing |
|---|---|---|
| Failed IC, no target | Negative | Invalid, hold / troubleshoot |
| Clinical urgency | Release likely negative now | Communicate delay; complete SOP |
| Valid IC, no target | Ignore other SOP criteria | Release only if full assay rules met |
Classification Frameworks
Not applicable.
Laboratory Notes
- Invalid ≠ negative, say so clearly when communicating holds
- Interpretation must follow the validated assay and laboratory procedure
- Never invent a negative from an inhibited run
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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