Overview
When QC fails, required controls are outside acceptable limits or violate local decision rules. Immediate response is to hold patient results, avoid release, notify/escalate per SOP, and begin troubleshooting.
Classification
| Action | Bench meaning |
|---|---|
| Hold / stop | Do not release affected patient results |
| Do not release | No clinical-plausibility override |
| Notify / escalate | Inform lead/supervisor per SOP |
| Troubleshoot | Start practical corrective checks |
Morphologic Features
Not applicable, this entry covers QC failure response, not morphology.
Laboratory Characteristics
- Containment comes before diagnosis of the root cause
- Team communication prevents accidental release during a hold
- Documentation preserves the timeline for investigation
Reference Intervals
Not a patient reference interval. QC acceptance limits and rejection rules are defined by the laboratory SOP for each assay and control level.
Clinical and Laboratory Significance
Releasing after a QC fail can send unreliable results to clinicians and put patients at risk.
Differential Considerations
Not a disease differential. Distinguish 'QC failed, on hold' from 'QC acceptable, clear to release' and from 'troubleshooting in progress' before any release decision.
Comparison Tables
QC failure checkpoints
| Pressure point | Safe response | Unsafe shortcut |
|---|---|---|
| Patients already run | Hold release; troubleshoot | Release because values 'look fine' |
| Busy queue | Contain first; communicate hold | Keep releasing while 'checking later' |
| Unsure of SOP | Escalate / ask lead | Invent an exception |
Classification Frameworks
Not applicable . WHO disease classifications do not define QC failure response.
Laboratory Notes
- Hold → notify → troubleshoot → document
- No 'looks okay' release
- SOP owns escalation path
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. (Laboratory quality and management chapters, verify current edition.)
CLSI and Professional Guidelines
- Institutional laboratory SOPs, locally adopted quality policies, and manufacturer instructions for use (IFU). Always verify current local practice.
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