How should a temperature excursion during storage or shipment be handled?

1What counts as a temperature excursion.

WHO defines a temperature excursion as an event in which a time- and temperature-sensitive product “is exposed to temperatures outside the range(s) prescribed for storage and/or transport”. Those ranges may differ for storage and transport, and the manufacturer sets them from stability data.¹ In the US, the stability testing programme’s results “shall be used in determining appropriate storage conditions and expiration dates”, and warehousing procedures must keep drug products under conditions of temperature, humidity and light that don’t affect their identity, strength, quality and purity.²³

The EU Good Distribution Practice guidelines of 5 November 2013 call a transport excursion a deviation. Storage conditions must be kept during transport “within the defined limits as described by the manufacturers or on the outer packaging”, and it should be possible to show that medicines “have not been exposed to conditions that may compromise their quality and integrity”.⁴

2What the rules require when one happens.

3Contain the product and record what happened.

At receipt, WHO’s model guidance asks the receiver to record any delays in transport and the status of any temperature recorders or time-temperature indicators, and to verify that the required storage and transport conditions were maintained.¹ WHO’s 2020 guideline adds that transport temperature data should be reviewed on receipt.⁵

Product that had an unacceptable excursion goes into quarantine and is not released until its checks are complete.¹ The EU GDP guidelines allow that segregation to be physical or through an equivalent validated electronic system.⁴ The data behind the record has to be reliable: EU GDP asks for transport monitoring equipment to be calibrated at least once a year, and storage alarms to be set and tested so that they alert when conditions leave their limits.⁴

4Assess the impact against stability data.

The assessment compares what the product actually experienced with what the evidence says it can tolerate. WHO’s model guidance is direct: “Product stability data must demonstrate the acceptable temperature excursion time during transport.”¹ That data comes from the stability programme that set the storage conditions in the first place.²

For returned temperature-sensitive product, the EU GDP guidelines ask for evidence covering each stage, from delivery to the customer and opening of the transport packaging to the product’s return to the distributor’s refrigerator.⁴ In the US, if the reason for a return implicates other batches, the investigation follows 21 CFR 211.192.⁶

5Decide the disposition, and record who decided.

In the US, product subjected to “extremes in temperature” because of an accident or equipment failure may not be salvaged and returned to the market. Where it is unclear whether that happened, salvage is allowed only with laboratory evidence that the product meets all its standards and inspection evidence that it was not exposed. Organoleptic examination counts only as supporting evidence, and records of each product’s name, lot and disposition are kept.⁷ Returned product records include the reason for return, the date of disposition and the final disposition.⁶

At an EU wholesaler, the Responsible Person decides the final disposition of returned, rejected and recalled products and approves any return to saleable stock.⁴

6Prevent the next one.

Storage areas need an initial temperature mapping exercise under representative conditions, with monitoring devices placed at the extremes it finds, and mapping repeated after a risk assessment or a significant change to the facility or its temperature control.⁴ WHO’s mapping supplement adds that new storage areas should be mapped both empty and in a normal loaded condition, and areas affected by the weather in the warmest and coldest seasons.⁸ Transport routes are risk-assessed to decide where temperature control is needed, and temperature-sensitive products travel in qualified packaging, containers or vehicles, with procedures for seasonal temperature variation.⁴ EU GMP Annex 15 asks manufacturers to monitor and record critical conditions continuously during transport unless justified, and to assess risks that monitoring doesn’t cover, such as delays and failure of monitoring devices.⁹

WHO recommends checking storage temperatures at least twice a day and preferably continuously, reviewing the records monthly and acting on systematic excursions. It also asks for contingency plans for power cuts, equipment failure and vehicle breakdown, and action plans for products exposed to excursions.¹

7How it runs in Seal.

In Seal, an excursion records its threshold, direction, start, end, duration, peak and source confidence, and opens a governed assessment with the exposed physical population already assembled from the pack-out and custody records. The cold chain blueprint describes how exposure is carried per lot, container or unit across movements, so a later event draws on the allowance already used, and how release, additional testing, shortened expiry, return or destruction can apply to one pallet or case range rather than the whole shipment. Detection is automatic; disposition is not, and no material returns to available stock until the approved decision has reached every affected container. In the warehouse, a returned container keeps its seals, condition, time outside controlled storage and excursion evidence, and goes back through quality assessment before it can be allocated.

Neil, Seal’s AI agent, can trace a cold-chain excursion: it reads the raw logger trace, calibration reference and time zone, the shipment’s packing and custody records and the product’s excursion criteria, and drafts a brief with a traceable exposure window. QA assesses product impact against the stability evidence and decides disposition; Neil does not invent stability allowances or release the shipment.