What a temperature mapping protocol should contain
The protocol is the contract for the study: fix the purpose, limits, sensor plan and analysis rules before a single logger is placed.
A mapping study is only as defensible as its protocol. Write and approve it before the study, and analyse the data against it afterwards — not the other way round.
Minimum contents
- Purpose and scope: which space, which products, which storage condition (e.g. 2–8 °C, 15–25 °C).
- Acceptance criteria: the limits every sensor must stay within, and how an excursion is defined.
- Sensor plan: number, locations (three-dimensional), rationale for each, and a diagram.
- Sensor calibration: calibration status, traceability and the uncertainty accepted for the study.
- Sampling interval and duration, and the loading condition (empty, loaded, or both).
- Analysis method: which statistics identify hot and cold spots; how gaps and faults are handled.
- Report contents and who reviews and approves the report.
Why the analysis rules belong in the protocol
If the hot spot is chosen as 'highest maximum' after the data are in, someone will ask whether 'highest mean' would have pointed elsewhere. Deciding the criterion first removes that argument and lets the analysis be repeated by anyone.
Frequently asked questions
- Who should approve a temperature mapping protocol?
- The study owner and the quality function at minimum; for GMP sites, the same roles that approve qualification protocols.
- Can a contractor's template be used as the protocol?
- Yes, after review against your own requirements — acceptance criteria, scope and analysis rules are your decisions and must be reflected in it.
References
- [1]WHO Technical Supplement 8 to TRS 961 Annex 9: Temperature mapping of storage areas (2015)
- [2]WHO Technical Report Series 961, Annex 9: Model guidance for the storage and transport of time- and temperature-sensitive pharmaceutical products (2011)
General technical guidance written against the cited sources. It is not regulatory or legal advice and does not replace the applicable standard, guideline or a qualified reviewer's judgement.
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