Overview
PCR contamination is unintended introduction of target nucleic acid into reactions or clean workspaces, which can generate amplification that does not reflect the patient's true status, classically causing false positives.
Classification
| Source | Typical clue |
|---|---|
| Amplicon carryover | Clustered positives after open post-PCR handling |
| Specimen cross-transfer | Positives adjacent to high-positive samples |
| Reagent contamination | Batch-wide or negative-control failures |
Morphologic Features
Not applicable, contamination is a process-integrity problem, not a morphologic entity.
Laboratory Characteristics
- Respect dedicated clean and post-amplification areas
- Review negative controls before releasing positives
- Investigate unexpected positive clusters promptly
Reference Intervals
Not applicable, contamination decisions use control performance and SOP validity rules, not patient reference intervals.
Clinical and Laboratory Significance
Unrecognized contamination can produce false-positive clinical reports and unnecessary interventions. Holding compromised runs protects patients.
Differential Considerations
Unexpected positives may reflect true infection, contamination, or assay artifact, resolve with controls, repeats, and SOP, not assumption alone.
Comparison Tables
Contamination response guardrails
| Observation | Unsafe action | Safe action |
|---|---|---|
| Negative control positive | Release patient positives anyway | Hold; follow contamination SOP |
| Odd low-level positives | Ignore as noise | Pattern review per assay rules |
| Post-PCR tubes in clean area | Continue prep nearby | Stop; re-establish unidirectional flow |
Classification Frameworks
Not applicable.
Laboratory Notes
- Unidirectional workflow awareness is a daily requirement
- Amplicon, specimen, and reagent pathways all matter
- Interpretation must follow the validated assay and laboratory procedure
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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