Temperature control under EU GDP: what is expected
EU GDP requires premises that hold storage conditions, mapping before use, calibrated monitoring equipment, alarms, and records that demonstrate control.
Chapter 3 of the EU GDP guideline (premises and equipment) sets the temperature expectations for wholesale distributors. Storage areas must be designed or adapted to ensure required storage conditions; equipment used to control or monitor the environment must be calibrated, and its calibration records kept; alarm systems must be in place to warn of excursions; temperature mapping must be carried out before use.
The practical chain
- Qualify the space: initial mapping under representative conditions.
- Place monitoring equipment where the mapping showed the greatest variation.
- Calibrate monitoring equipment and set alarms according to the product limits.
- Record continuously; review records; investigate excursions and assess impact.
- Re-map after modifications or as the risk assessment requires.
Chapter 9 extends the same expectations to transportation: temperature-controlled vehicles and containers must be qualified and monitored.
The chain, and what evidences each link
Chapter 3 of the EU GDP guideline sets the expectations for premises and equipment, and chapter 9 extends them to transport. Read as a sequence they form a chain in which each link produces the evidence the next one needs.
| Requirement | Evidence that satisfies it |
|---|---|
| Storage areas maintain the required conditions | Initial mapping under representative conditions, before use |
| Monitoring equipment placed where variation is greatest | A monitoring plan tracing each sensor to a mapped position |
| Equipment calibrated at defined intervals | Certificates covering the range and points actually policed |
| Alarms set and responded to | Challenge-test records, escalation evidence, acknowledged alarm log |
| Records demonstrate control | Reviewed monitoring data, retained and readable, with deviations linked |
| Re-mapping after significant change | Change control that triggers it, and a documented risk-based interval |
| Transport qualified and monitored | Vehicle or shipper qualification, plus a logger with every sensitive shipment |
What the guideline does not say
GDP states expectations, not methods. It does not specify sensor counts, durations, sampling intervals or acceptance criteria, and looking for those numbers in the text is a common frustration. The numbers come from two other places: the technical guidance the industry uses — WHO Technical Supplement 8 for mapping, Supplement 16 for monitoring systems — and the product label conditions, which set the limits.
That division is deliberate and it puts the burden on your protocol. A study is defensible because its protocol justified its choices against the space and the products, not because a guideline prescribed them.
Where distributors are found wanting
- A site-default storage condition applied to every area, including one holding a product with tighter limits. Common, serious, and invisible until someone compares the SOP with the shelves.
- Monitoring sensors installed at commissioning for cabling convenience and never moved after the mapping found the hot spot elsewhere.
- Alarm limits set at the acceptance limits, with no allowance for the sensor's own uncertainty.
- Monitoring data accumulating unreviewed. Data nobody reads is not a control; it is evidence that the information was available.
- No re-mapping interval, or an interval with no rationale — the same number applied to a stable ambient store and a cold room.
- Transport treated as out of scope. Chapter 9 applies the same expectations to vehicles and containers, and the ambient variation there is far larger than in any building.
Frequently asked questions
- Does GDP specify how many sensors to use for mapping?
- No. It requires mapping under representative conditions; the method is left to technical guidance and the distributor's risk assessment.
- Are ambient (15–25 °C) stores exempt from mapping?
- No. The requirement applies to storage areas generally; ambient stores are frequently where the largest gradients occur.
References
- [1]EU Guidelines on Good Distribution Practice of medicinal products for human use (2013/C 343/01)
- [2]WHO Technical Supplement 8 to TRS 961 Annex 9: Temperature mapping of storage areas (2015)
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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