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General information for supply and lab staff, not medical advice. Always follow the product manufacturer’s labeling.
Short answer
For a shipment described as 2 to 8 degrees Celsius, the range is not set by the carrier or the box. WHO’s 2011 model guidance says storage and transport temperature ranges are determined by the product manufacturer, based on stability data. A shipment is only “2 to 8 C” in a meaningful sense when a qualified package, a profiled route and an arrival check all hold that range from departure to the recipient’s temperature-controlled store.
Definition and scope
“2 to 8 degrees Celsius shipping” means moving a temperature-sensitive product so that it stays within a stated refrigerated range for the whole journey. It is one band within the wider practice of the cold chain. WHO calls a departure from the prescribed range a temperature excursion: exposure of a time- and temperature-sensitive product to temperatures outside the range prescribed for storage and/or transport.
This page covers the checklist a supply buyer needs in hand. For the wider picture see cold chain medical supplies shipping, pharma cold chain logistics (temperature bands, GDP, excursions) and evaluating cold chain carriers and packaging.
What 2 to 8 C means in a shipment: who sets the range
The manufacturer sets the range from stability data (WHO TRS 961, Annex 9, glossary). So the first item to have before booking is the product’s labeled transport range, not a carrier’s package name. If the label says something other than 2 to 8 C, a “2 to 8 C” shipper does not match it.
Qualified packaging versus a rated box
WHO section 6.8.3 asks that insulated passive containers, including their ancillary packaging (dry ice, ice or gel packs, phase change materials, partitions, dunnage), be qualified to keep the product within the range needed to meet the stability profile stated by the manufacturer. Qualification covers:
- the full packaging assembly;
- the thermal conditioning regime for coolants;
- the minimum and maximum shipping volume, weight and thermal mass;
- correct placement of temperature monitors;
- the route and ambient profile from the point of departure to the point of arrival in the recipient’s temperature-controlled store.
A carrier statement is a different kind of claim. FedEx’s own cold shipping page says its cold shipping package keeps shipments at 2 C to 8 C for 48 or 96 hours, other options run “up to 120 hours” (PharmaTherm) or “up to five days” (Credo Cube), and adds that “Actual cooling duration varies, depending on external temperatures.” That page describes package options and monitoring services; it does not describe the qualification elements above, so a buyer still needs to confirm them for their own load and lane.
Route, season and duration
WHO section 6.3 says to profile and qualify transport routes, choosing methods against the anticipated ambient temperature and humidity conditions throughout the year, using published standards, weather data, and laboratory and field tests. The practical point from the FedEx statement is the same: stated hours depend on external temperature, so a duration that holds on a mild lane may not hold in a summer or winter extreme. Delays matter because they consume that duration.
Monitoring and arrival checks
WHO 6.5.4 recommends chemical or electronic freeze indicators, electronic loggers (with or without alarms) and/or other suitable indicators, preferably for external distribution, and to “monitor and document indicator status upon arrival.” WHO 6.8.1 adds that containers should be closable so the recipient can establish there was no tampering. For concepts behind logger data see mean kinetic temperature and temperature monitoring alarms. On the receiving side, the medical refrigerator is the destination store the lane ends in.
| Checklist item | Source of the requirement |
|---|---|
| Labeled transport range for the product | Manufacturer, from stability data (WHO TRS 961 Annex 9) |
| Packaging qualified as a full assembly, with conditioning and load limits | WHO 6.8.3 |
| Route profiled across the year’s ambient conditions | WHO 6.3 |
| Monitor placed correctly and its status documented on arrival | WHO 6.8.3 and 6.5.4 |
| Closure that shows tampering | WHO 6.8.1 |
Common misunderstandings
- A “2 to 8 C box” is not a qualified lane. The package statement is one input; qualification and route profiling are separate steps in WHO’s guidance.
- The carrier does not define the range. The manufacturer does.
- Dry ice is not a universal coolant. For vaccines, CDC’s vaccine storage and handling page states that dry ice should never be used for non-emergency vaccine transport, and that digital data loggers should be used for routine storage and transport, with at least one backup logger or temperature monitoring device. These statements are vaccine-specific.
FAQ
What does 2 to 8 degrees Celsius mean for shipping medical supplies?
It is the refrigerated range a product must stay within in transit. Per WHO’s 2011 guidance, the range for a given product comes from its manufacturer’s stability data.
What does 2 to 8 C cold chain medical shipping require?
According to WHO’s guidance: qualified packaging, a route profiled for year-round conditions, monitoring devices, and documented indicator status on arrival.
How long does a 2 to 8 C shipper hold the range?
It depends on the package and conditions. FedEx states 48 or 96 hours for its cold shipping package and that actual duration varies with external temperatures.
Sources
- WHO Technical Report Series 961 (2011), Annex 9, Model guidance for the storage and transport of time- and temperature-sensitive pharmaceutical products, checked 1 November 2026.
- FedEx, Refrigerated and cold shipping, checked 1 November 2026.
- CDC, Vaccine storage and handling, checked 1 November 2026.
