Overview
A calibration failure occurs when a calibration check does not meet its acceptance criteria, or when QC drifts out of range immediately after calibration, meaning the analyzer has not demonstrated it measures accurately. Every result from that system is unverified until this is resolved.
Classification
| Decision checkpoint | Action |
|---|---|
| Calibration outside acceptance criteria | Quarantine affected test(s) on that instrument |
| Post-calibration QC also fails | Treat as a system-level problem, not a one-off |
| Cause not yet identified | Investigate calibrator, procedure, instrument, environment |
| Recalibration or service completed | Confirm acceptance criteria met before QC |
| QC confirmed within range | Resume testing and document the full timeline |
Morphologic Features
Not applicable, this entry covers an instrument/process decision, not cell or specimen morphology.
Laboratory Characteristics
- Failure can affect one analyte or the whole panel depending on cause
- Common causes: calibrator handling, procedure error, instrument fault, environmental disturbance
- A drifting QC right after calibration is a strong signal the calibration itself is invalid
Reference Intervals
Not applicable as a patient reference interval. Calibration acceptance criteria are instrument- and manufacturer-specific and defined by the local laboratory procedure.
Clinical and Laboratory Significance
A calibration failure has no direct patient diagnostic meaning by itself, its significance is that results produced by an unverified measuring system may be systematically inaccurate without an obvious flag, risking a wrong clinical decision.
Differential Considerations
Distinguish a true calibration/instrument problem from a calibrator-handling error (expired, degraded, or improperly prepared material) and from a single QC excursion unrelated to calibration, the investigation and corrective action differ for each.
Comparison Tables
Calibration failure checkpoints
| Pressure point | Safe response | Unsafe shortcut |
|---|---|---|
| STAT results pending | Quarantine testing; investigate quickly; communicate delay | Report results despite the failed calibration |
| Repeated calibration failure | Investigate calibrator, procedure, and instrument systematically | Keep repeating the attempt hoping it passes |
| Instrument 'seems fine' | Trust verification data, not appearance | Assume normal-looking output means accurate output |
Classification Frameworks
Not applicable . WHO disease classifications do not define laboratory calibration failure response.
Laboratory Notes
- Quarantine → investigate → recalibrate/service → verify → resume
- Failed calibration invalidates the whole measuring system, not one result
- Document the failure, cause, corrective action, and verification before resuming
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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