Shipping Biological Materials With A Life Sciences Courier

Shipping biological materials and samples requires specialised expertise, yet this level of care need not come at the expense of speed. These shipments can range from low-risk diagnostic specimens to highly regulated infectious substances, with transport requirements shaped by a complex regulatory framework and inherent biological risks.

This guide explains what constitutes biological material and why classification matters. It also outlines how regulations govern the shipment of biological samples and highlights why working with a life sciences courier can reduce risk when sending sensitive materials across borders.

What is considered biological material?

Biological material typically refers to substances derived from humans, animals, plants, microorganisms or other biological sources.

In life sciences and healthcare logistics, this includes items such as diagnostic samples, clinical trial specimens, blood, tissue, cultures, DNA, RNA, vaccines, reagents and other research or healthcare materials.

From a shipping perspective, the key consideration is not just whether an item is biological, but how it's classified for transport. Biological material may be defined as:

• Non-regulated or exempt
• Biological substance, Category B (UN3373)
• Category A infectious substance (UN2814 or UN2900, depending on whether it affects humans or animals)

Some biological materials are not classified as dangerous goods. Others fall under strict regulations because they're known or reasonably expected to contain pathogens. In the UK, classification remains the sender's responsibility, meaning each shipment must be assessed individually. As a result, biological materials cannot be handled as a single category. Requirements vary depending on their risk profile and regulatory classification.

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Understanding biological materials, classification, and shipping requirements

While biological materials encompass a wide range of products, their handling in logistics is determined less by their nature than by the risk they pose during transport. This is where classification becomes central, determining how a shipment must be packaged, labelled, documented, and handled throughout its journey.

All biological shipments are governed by overlapping international and domestic regulations, which vary depending on what is being shipped, how it is classified, and the mode of transport. At the heart of these requirements is the United Nations (UN) dangerous goods framework, which defines how infectious substances are classified and assigns the identification numbers used throughout global transport networks. Requirements differ for exempt materials, Category A substances, and Category B substances. 

Infectious biological substances require specialist healthcare logistics networks, and at a high level, are divided into two main categories, with Category A further distinguished by substances affecting humans, animals and medical waste, where applicable:

• Category A (UN2814 - affecting humans) refers to materials that can cause serious or life‑threatening disease in humans. Examples include samples of high‑risk pathogens such as Ebola, SARS-CoV, and certain respiratory viruses like HPAI avian influenza. These shipments are subject to the highest level of regulatory control and require UN‑certified packaging in accordance with Packing Instruction 620 (PI620), as prescribed by the International Air Transport Association (IATA) based on UN recommendations, as well as trained personnel and strict documentation.
• Category A (UN2900 - affecting animals) applies to infectious substances that primarily pose a risk to animal health. These include samples used in veterinary and agricultural research, such as foot-and-mouth disease (FMD), swine fever, rabies, African swine fever (ASF), and certain strains of avian influenza. While the risk profile differs, the same stringent packaging, handling, and documentation requirements apply under PI620.
• Category A (UN3549) applies in certain medical waste contexts where the waste is known or reasonably expected to contain Category A infectious substances.
• Category B (UN3373) includes lower‑risk biological substances such as diagnostic specimens (e.g., blood, tissue, or swabs), in which pathogens may be present but do not meet Category A thresholds. These shipments must comply with Packing Instruction 650 (PI650), also defined by IATA in alignment with UN regulations, which mandates a triple packaging system consisting of a primary receptacle, secondary packaging, and a rigid outer container.

This dangerous goods distinction is not just administrative - it directly affects risk management, regulatory compliance, operational processes and packaging. Misclassification can result in shipment delays, carrier refusals, customs issues, or, in more serious cases, legal and safety risks.

Several established frameworks underpin these requirements:

• The United Nations (UN) defines classification systems and assigns identification numbers for Category A infectious substances (UN2814), Category B biological substances (UN3373), and solid carbon dioxide, aka Dry Ice (UN1845), as well as packaging standards.
• The International Air Transport Association (IATA) translates these into operational standards for air transport, including packaging instructions (PI620 and PI650), labelling, and documentation.
• For road transport in Europe, the ADR (Accord relatif au transport international des marchandises dangereuses par route) sets equivalent rules for the safe carriage of dangerous goods by road.
• At a national level, UK dangerous goods regulations incorporate these international standards and set legal obligations for classification, packaging, labelling, and transport.
• Good Distribution Practice (GDP) - set and enforced by regional regulatory authorities - ensures that temperature‑sensitive healthcare products are transported in a way that maintains their quality, integrity, and traceability.
• Qualified and validated packaging guidelines are also provided by the International Safe Transit Association (ISTA) and are often referred to alongside GDP requirements.

Together, these frameworks provide a structured and auditable approach to shipping biological materials, ensuring each shipment is handled according to its specific risk profile, regulatory classification, and temperature requirements. Understanding your life science and healthcare logistics partner's dangerous goods capabilities and approvals is equally important, as these may determine whether they can transport your products safely and compliantly.

What biological materials are commonly shipped, and what temperature range do they require?

As the examples below show, most biological shipments fall into either non‑regulated or controlled categories, or are classified as Category B biological substances (UN3373). Category A materials, while important, are far less common and both require specialist condition-controlled and regulation-compliant logistics. These varying requirements highlight the need for flexible temperature-controlled logistics solutions.

Why is specialised logistics for shipping biological material important?

Shipping biological material requires careful control because these shipments often carry scientific, clinical or patient value. Even a small biological sample may support a diagnosis, a clinical trial, a research programme, a manufacturing process or a vital healthcare decision. If the shipment is delayed, handled incorrectly, or exposed to unsuitable conditions, the impact can extend beyond logistics to include data integrity, patient outcomes, and regulatory compliance.

Key risks involved are both biological and operational, and can include:

• sample degradation or loss of viability
• contamination
• temperature excursion
• packaging failure
• documentation errors
• Customs delays
• missed clinical or laboratory timelines

These risks increase with international shipments, where materials move across multiple handling points, transport modes, and regulatory environments. A shipment that is compliant domestically may still face delays or refusal if it does not meet air transport regulations (IATA), import requirements, or documentation standards in the destination country.

Maintaining product integrity, therefore, relies on a combination of validated packaging and qualified cooling systems for shipment profile and route, continuous monitoring (data loggers or real-time sensors), and operational oversight (priority handling at transfer points). Temperature‑controlled packaging creates the right conditions, but monitoring ensures those conditions are maintained. Passive data loggers record temperature throughout the journey, providing an auditable trail for compliance. Active or real‑time sensors enable proactive intervention if conditions begin to drift outside acceptable ranges.

This is where quality control and monitoring capability become critical. Through control tower environments, shipments can be tracked in real time, with alerts triggered for delays, route deviations, or temperature risks where active data loggers are used. This allows teams to take corrective action in transit by prioritising handling, rerouting, or additional coordination, rather than reacting after a failure occurs.

Timing is also a key factor. Many biological materials are time‑ and condition‑sensitive, meaning that speed alone is not enough—it must be matched with consistent handling, visibility, and coordination across the network to meet clinical or laboratory timelines.

Alongside operational risks, regulatory compliance and customs clearance add another layer of complexity. Accurate classification, proper documentation, and alignment with frameworks such as IATA, ADR, and GDP are essential to avoid delays, inspections, or rejection at the border. This makes advanced planning and coordination with a logistics provider a critical step before shipment.

For this reason, shipping biological materials is not a standard courier task. It requires a specialist logistics approach that combines temperature control, regulatory knowledge, monitoring, and international logistics expertise.

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What packaging materials and containers are used when shipping biological materials?

Maintaining the integrity of biological materials depends on selecting the right packaging and temperature control approach. These decisions are driven by the shipment’s classification, stability profile, and transit time, and must align with regulatory requirements and real‑world transport conditions.

The type of packaging required also influences the logistics model itself, as not all medical courier providers support the same levels of classification or temperature control. While some shipments can move through standard Category B networks at controlled or refrigerated temperatures, higher‑risk Category A materials or ultra‑low cryogenic shipments typically require more specialised capabilities, equipment, and handling expertise.

Validated and fit-for-purpose packaging

Packaging is the primary control system for protecting biological materials in transit. It must meet UN and IATA requirements, ensuring it can withstand the conditions encountered during transport, including:

• pressure changes (particularly during air transport)
• vibration and handling impacts
• thermal variation over time

Packaging must also align with the relevant dangerous goods framework. Category B shipments (UN3373) follow Packing Instruction 650 (PI650), while Category A shipments (UN2814, UN2900, and UN3549) require more stringent Packing Instruction 620 (PI620). These ISTA standards define the design, performance, and testing requirements for compliant packaging systems. For Category B shipments in particular, this typically involves a triple packaging system, consisting of:

• a primary receptacle (holding the biological material)
• secondary packaging (leakproof and protective)
• a rigid outer container suitable for transport

 

Passive vs active temperature-controlled packaging solutions

Temperature control solutions typically fall into two categories:

• Passive systems use insulated packaging combined with refrigerants such as gel packs and phase-change materials (PCMs). They are time‑limited but cost‑effective, making them suitable for shorter transit times or well‑defined shipping lanes.
• Active systems use powered refrigeration or heating units to maintain a consistent internal environment. These are typically used for longer transit times, higher‑value shipments, or materials with narrow temperature tolerances, where tighter control is required.

Dry ice pellets and cryogenic shipping containers

For frozen and deep-cold temperature shipments, specialist cooling methods are required:

• Dry ice (UN1845) is the solid form of carbon dioxide, maintaining a temperature of approximately -78 °C. It is commonly used for deep frozen shipments, including biological samples and pharmaceuticals. Because it sublimates into gas over time, packaging must account for ventilation, duration, and safe handling.
• Cryogenic shipping, typically using liquid nitrogen vapour, operates at temperatures below -150 °C and is used for highly sensitive materials such as cell and gene therapies, stem cells, and reproductive materials, where preserving viability is critical.

How to ship biological material across international borders?

Once classification, packaging, and temperature requirements are defined, the shipment process can be structured to ensure safe, compliant, and timely import or export. The steps below provide a high-level overview and should not replace formal dangerous goods procedures or specialist advice provided by the International Safe Transit Association (ISTA).

Step 1: Package the biological sample

Packaging must be validated for the expected transit time and route conditions and matched to the shipment’s classification, physical state and temperature profile. For many diagnostic and Category B shipments, this involves a triple packaging system:

• Primary receptacle - the container directly holding the biological material (such as a swab tube or plastic slide holder)
• Secondary packaging - leakproof packaging that protects and contains the primary receptacle (for example, a leak-proof or shatterproof biohazard bag)
• Rigid outer packaging - durable external packaging suitable for transport and handling (often a cardboard box with internal padding)

Step 2: Classify the shipment and prepare documentation

Accurate classification of the biological substance is essential before shipping. The sender is responsible for accurately classifying the substance and must determine whether the material is exempt, non-regulated, Category B (UN3373), or Category A (UN2814, UN2900, or UN3549).

Documentation requirements vary depending on the classification, destination, and transport mode, but typically include:

• Shipper and receiver details
• Clear description of contents and classification
• Quantity and packaging information
• Customs documentation and any required import permits
• Dangerous goods declaration (where applicable)
• Temperature control or dry ice details

For international shipments, documentation must align precisely with labelling, packaging, and regulatory requirements to avoid delays or refusal at borders.

Step 3: Apply correct labelling and markings

Your packages must be clearly marked and labelled in line with classification and transport regulations. This may include:

• UN3373 diamond mark for Biological Substance, Category B shipments or an exempt label for human or animal products that do not contain pathogens and therefore do not fall under UN3373 classification
• Proper shipping name and UN number (where required)
• Shipper and receiver details
• Orientation arrows for liquid substances
• Dry ice labels (UN1845) for frozen shipments
• Handling marks required by the carrier or transport mode

Labels must be clear, durable, legible and consistent with the documentation, as discrepancies are a common cause of shipment delays.

Step 4: Select your temperature-controlled transportation

Temperature selection should be based on the biological material’s stability profile, required temperature range, route and transit time. For example, some materials may be stable at controlled ambient temperatures, while others may require chilled, frozen, dry ice or cryogenic solutions.

Specialist logistics support can assist with:

• Route planning and transit-time optimisation
• Temperature-controlled packaging selection
• Monitoring and shipment visibility
• Contingency planning for delays and deviations
• Customs clearance and regulatory compliance

For complex, temperature‑sensitive, or regulated shipments, it is important to discuss requirements with a logistics provider in advance. This ensures the correct combination of packaging, transport mode, monitoring, and compliance processes are in place to maintain product integrity from origin to destination.

 

Why can you trust DHL Express to ship your biological materials across borders?

When shipping biological materials internationally, speed matters, but speed alone isn’t enough. Maintaining temperature integrity, meeting regulatory requirements and coordinating across borders all require a logistics partner with the right expertise, infrastructure, and control.

DHL Express supports time-critical life science & healthcare shipments through its Medical Express service, combining fast global air transport with priority handling, temperature-controlled packaging options, and end-to-end visibility. This includes support for Category B biological substances (UN3373), dry ice shipments (UN 1845), and other temperature-sensitive materials moving across international networks.

For more complex requirements, including Category A infectious substances or cryogenic shipments, specialist capabilities are delivered through CRYOPDP, part of DHL Express, enabling compliant handling across a broader range of temperature and regulatory needs.

Whether shipping diagnostic specimens, clinical trial samples, or specialised biological products, working with a life science courier helps ensure consistent handling, regulatory compliance, and protection of product integrity throughout the journey.

To move forward, it’s important to discuss your specific requirements with a logistics provider to ensure the right combination of packaging, transport, monitoring, and compliance support is in place for your shipment. Explore DHL Express' life sciences and healthcare logistics solutions, including pharma and biotech logistics, clinical trials logistics, medical device logistics, and consumer healthcare logistics.