Overview
A temperature excursion is a period during which a storage unit holding reagents, controls, or specimens fell outside its required temperature range, requiring quarantine and assessment before the contents can be trusted for patient testing.
Classification
| Step | Action |
|---|---|
| Quarantine | Set aside all affected items; do not use |
| Assess | Compare duration and severity to storage requirements |
| Decide | Discard, replace, or clear for continued use per SOP |
| Document | Record excursion details, affected items, and outcome |
| Notify | Inform supervisor / responsible party |
Morphologic Features
Not applicable, this entry covers a storage-condition safety practice, not morphology.
Laboratory Characteristics
- Current normal temperature does not undo an earlier excursion
- Every item stored during the excursion should be identified, not only the most obvious ones
- Manufacturer storage requirements define acceptable range and tolerance
Reference Intervals
Not applicable as a patient reference interval. Acceptable storage temperature ranges are defined by manufacturer instructions and local procedure for each reagent, control, or specimen type.
Clinical and Laboratory Significance
Reagents or controls that lost stability during an excursion can shift patient results without any visible warning, so unassessed use directly threatens result reliability.
Differential Considerations
Distinguish a genuine excursion requiring quarantine from a brief door-opening blip that stays within tolerance, and from a sensor/alarm malfunction that did not reflect a real temperature change, confirm with the chart, not the alarm alone.
Comparison Tables
Temperature excursion checkpoints
| Pressure point | Safe response | Unsafe shortcut |
|---|---|---|
| Unit reads normal now | Assess the excursion itself before use | Assume contents are fine because temperature recovered |
| Busy bench, need reagents | Quarantine and use only cleared alternatives | Keep using affected reagents while assessment is pending |
| Excursion confirmed | Document, notify supervisor, follow decision pathway | Fix the alarm and move on without assessing contents |
Classification Frameworks
Not applicable . WHO disease classifications do not define temperature excursion practice. Organizations such as WHO, ISO, CLSI, CAP, or IFCC may promote similar cold-chain principles as examples only.
Laboratory Notes
- Quarantine → assess → decide → document → notify
- Normal current temperature ≠ contents unaffected
- No patient testing with questionable materials until assessed
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.
Frequently Asked Questions
Common questions about using this Temperature Excursion additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Temperature Excursion laboratory reference?
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