Ensuring safe transport of temperature-sensitive lab samples requires strict control over packaging, monitoring, and compliance throughout the entire logistics chain. A validated, end-to-end approach prevents degradation, safeguards accuracy, and guarantees reliable test results.
Summary of this article
The safe transport of laboratory samples at a controlled temperature is essential for the reliability of test results. Temperature-sensitive samples can become unusable if they fall outside their required temperature range. To prevent this, you must use specialised packaging, validated processes and temperature monitoring. Different types of samples require specific temperature zones, ranging from deep-frozen to room temperature, and the correct packaging materials are crucial for maintaining these conditions during transport.
The transport of temperature-sensitive laboratory samples is subject to strict national and international regulations. In the Netherlands, you must comply with the Transport of Dangerous Substances Act and the ADR Convention (European Agreement concerning the International Carriage of Dangerous Goods by Road) when transporting biological or medical samples.
The key regulations you need to take into account:
For temperature-sensitive samples, the GDP (Good Distribution Practice) guidelines also apply, which set requirements for temperature control during transport. These require validation of your packaging solutions and continuous monitoring of temperature conditions.
Important: always contact a specialist if you are unsure about the correct classification and packaging requirements for your specific samples. The regulations are complex and the consequences of incorrect transport can be serious, both for the safety and the reliability of your samples.
When transporting laboratory samples, different temperature zones are important, depending on the type of sample and the intended analysis. Maintaining the correct temperature is essential for the integrity of your samples.
The most important temperature zones are:
Ultra-deep frozen (-80°C to -60°C) – For long-term storage of cells, tissue and certain enzymes. Usually requires dry ice or special cryogenic packaging.
Deep-frozen (-25°C to -15°C) – For serum, plasma and other blood components that need to be stored for longer periods.
Refrigerated (2°C to 8°C) – The most common zone for blood, urine, microbiological cultures and many diagnostic samples.
Room temperature (15°C to 25°C) – For certain histological samples, some blood tests and samples that are not temperature-sensitive.
Body temperature (37°C) – Sometimes required for specific microbiological samples that must remain viable.
For each type of sample, it is important to know:
| Sample type | Optimal temperature range | Maximum transport time |
| Whole blood | 2°C to 8°C | 24–48 hours |
| Serum/plasma | -20°C (long-term) | Several days with proper packaging |
| Urine | 2°C to 8°C | 12–24 hours |
| Cell cultures | -80°C or liquid nitrogen | Depending on packaging method |
It is important to check with the receiving laboratory exactly which temperature range is required, as some tests may have specific requirements that deviate from standard guidelines.
Ensuring temperature integrity during transport is a complex process that requires careful planning and the right resources. Here are the key methods for maintaining a consistent temperature for your lab samples:
A reliable cold chain comprises these essential elements:
It is important to view the entire chain as a single integrated system. The weakest link ultimately determines whether your samples arrive in good condition. Therefore, pay attention to every stage, from the moment samples are collected until they are analysed in the lab.
The choice of packaging materials is crucial to the success of temperature-controlled transport. Different materials have specific properties that make them suitable for certain temperature zones and transport durations.
The most effective materials for temperature control are:
For optimal results, a combination of materials is often required:
| Temperature zone | Recommended combination | Typical shelf life |
| -80°C to -60°C | EPS box with dry ice | 24–72 hours |
| -25°C to -15°C | VIP with frozen PCMs | 48–96 hours |
| 2°C to 8°C | EPS with chilled PCMs | 24–120 hours |
| 15°C to 25°C | Insulation with room-temperature PCMs | Up to 120 hours |
When selecting packaging materials, you should also consider:
For the transport of high-value or critical samples, it is advisable to opt for validated packaging systems specifically designed for medical and laboratory applications. These systems have been tested under various conditions and offer the highest reliability.
At Faes, we see that temperature-controlled transport can rarely be solved by selecting only an insulation material or cooling element. Performance is determined by the combination of the packaging, its contents, the transport duration and the conditions encountered along the way. That is why we start by analysing the complete transport profile.
Our engineers first identify the required temperature range, maximum transport duration, expected ambient temperatures and the quantity of material being transported. Loading moments, temporary storage and the number of times the packaging is opened can also affect temperature integrity.
We then determine factors such as the insulation material, the position and quantity of cooling elements and the layout of the interior. We also ensure that laboratory samples do not come into direct contact with frozen elements. A packaging solution may maintain the correct average temperature while localised hot or cold spots still cause damage.
A material value or cooling-element specification does not show how the complete packaging solution will perform during an actual transport. The selected configuration must therefore be assessed using the real contents, loading arrangement and expected transport duration. The positioning of temperature sensors is also important, because a single measuring point is not always representative of the entire packaging.
Our experience with custom packaging shows that temperature control, shock protection, ease of use and traceability should not be designed separately. By combining these requirements from the start, we create a reproducible configuration with clear instructions for loading, use and monitoring.
The safe transport of lab samples at a controlled temperature requires a careful approach that takes into account legal requirements, temperature zones, cold chain integrity and the correct packaging materials. A systematic approach allows you to safeguard the quality of your samples and guarantee reliable test results.
Every step in the process is important – from choosing the right packaging to implementing temperature monitoring and establishing emergency procedures. Investing in good transport solutions pays off in more reliable test results and fewer lost samples.
At Faes, we understand the unique challenges of transporting temperature-sensitive materials. With our expertise in custom industrial packaging for demanding conditions, we can help you find the perfect solution for your specific transport needs, whether it involves medical samples, pharmaceutical products or other temperature-sensitive materials.
Always consult the receiving laboratory’s guidelines for the exact temperature requirements. As a general guideline: blood samples usually 2–8°C, serum/plasma for long-term storage –20°C, genetic material often –80°C. Take into account the stability of the parameters to be measured; some enzymes or hormones have more specific temperature requirements.
If in doubt, contact the laboratory for advice regarding your specific samples.
For reliable temperature monitoring, electronic data loggers with a real-time alert function are the most effective. These continuously record temperature data and can report deviations immediately. USB data loggers offer good value for money for shorter transports. For critical samples, validatable systems with calibrated sensors and certification are recommended. Ensure the system can export temperature data for documentation and quality assurance.
Condition cooling elements at the exact desired temperature for at least 24–48 hours in advance. For 2–8°C transport, PCMs or gel packs must be pre-cooled in a calibrated fridge (not in a freezer). For frozen transport, packs must be fully frozen in a freezer with a constant temperature. Never place chilled packs directly against temperature-sensitive samples; always use a buffer to prevent freezing. Always follow the manufacturer’s conditioning instructions.
Common errors include: insufficiently conditioned cooling elements, excessive exposure to ambient temperature during packaging, incorrect placement of cooling elements causing samples to freeze, and insufficient insulation material. Prevent these by implementing standardised packaging procedures, training staff, validating packaging under various conditions, and applying temperature monitoring. Also take seasonal temperature variations into account when choosing your packaging method.
Carlo Leijten is an account manager at Faes specializing in medical applications and audiovisual equipment. He helps customers in these plastics industries develop customized packaging solutions that meet stringent requirements for protection, cleanability and mobility.
More articles by Carlo LeijtenGood packaging doesn’t just happen by chance. Using a tried-and-tested approach, our specialists guide you step by step from the initial idea to the finished product.
