Overview
Basic PCR troubleshooting is the SOP-directed response to invalid, unexpected, or unclear amplification results: hold release, verify controls, identify the failure pattern, then repeat or recollect as the validated procedure requires, never fabricating a negative.
Classification
| Step | Safe action |
|---|---|
| Hold | Stop release of affected results |
| Check controls | Review PC, NC/NTC, IC |
| Name pattern | No amp / inhibition / contamination / late / setup |
| SOP action | Repeat, re-extract, recollect, escalate |
| Release | Only after validity criteria are met |
Morphologic Features
Not applicable, troubleshooting describes workflow validity, not morphologic identification.
Laboratory Characteristics
- Communicate holds clearly, invalid is not negative
- Scope specimen-level vs run-level failures before mass repeats
- Document actions for quality review
Reference Intervals
Not applicable, troubleshooting uses assay control expectations and SOP acceptance limits. There are no universal Ct cutoffs.
Clinical and Laboratory Significance
Forcing results from failed amplification can produce false-negative or unreliable clinical reports. Holding and correcting the pathway protects patients.
Differential Considerations
Laboratory differential includes inhibition, contamination, true target absence, late assay-specific calls, and reagent/setup failure, resolve by SOP pathway, not bedside guesswork.
Comparison Tables
Troubleshooting interpretation guardrails
| Situation | Unsafe framing | Safe framing |
|---|---|---|
| Failed IC, quiet target | Negative, release now | Invalid, hold / troubleshoot |
| Failed run + discharge pressure | Invent not detected | Communicate delay; complete SOP |
| Late curve | Mild disease by Ct | Assay-specific interpretation only |
Classification Frameworks
Not applicable.
Laboratory Notes
- NEVER invent a negative from a failed run
- Distinguish no amplification, inhibited amplification, late amplification, and valid control performance
- 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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