Cryogenic Transport of Biomaterials: Shipping Embryos, Cells, and Samples in Dry Shipper Containers

Cryogenic transport, cryo transport, and cryo shipping are specialized services for transporting biological materials at ultra-low temperatures. The primary purpose of this type of transportation is to preserve the properties of the samples throughout the entire journey without disrupting the required storage conditions.

Liquid nitrogen or specialized dry shipper containers are used for transportation. These containers maintain temperatures significantly below −150°C. Such temperature conditions are essential for preserving the viability of embryos, oocytes, sperm cells, stem cells, tissues, and other biological samples.

Modern cryogenic logistics, biological material transportation, and biomedical shipping include not only delivery but also a range of essential procedures:

• sample preparation and identification;
• selection of a suitable container;
• temperature control;
• preparation of accompanying documentation;
• compliance with the requirements of carriers and receiving medical institutions.

Reliable cryogenic transport is particularly important for international fertility treatment programs, biobanks, and scientific research, where even a brief temperature deviation may result in the loss of valuable material.

Where Is Cryo Shipping Used?

Today, cryo shipping, cryogenic shipping for IVF, and cryo transport are used in various areas of modern medicine and biotechnology. The development of international cooperation between clinics and research centers has significantly increased the volume of these shipments.

The most common areas of application include:

• in vitro fertilization programs (IVF);
• biobanks;
• medical laboratories;
• transplant medicine;
• genetic research;
• cell therapy;
• scientific projects.

IVF and Embryo Transportation

In the field of in vitro fertilization (IVF), cryo shipping of embryos is used to transport frozen embryos, oocytes, and sperm cells between clinics, laboratories, and cryobanks.

This type of transportation is required when patients change clinics or relocate, participate in international fertility treatment programs, transfer materials between branches of medical centers, or use donor material.

During transportation, particular attention is paid to preserving frozen cells, maintaining the required temperature conditions, and complying with the standards of assisted reproductive technologies. Properly organized IVF logistics also play an important role by coordinating the actions of the sender, carrier, and receiving party.

Biobanks and Laboratories

Another important area is the transportation of biological materials between biobanks, research centers, and medical laboratories.

Depending on the purpose of the shipment, the following materials may be transported:

• tissue samples;
• stem cells;
• genetic material;
• blood serum;
• plasma;
• research samples.

When organizing such shipments, particular attention is paid to maintaining an uninterrupted temperature regime, ensuring proper packaging, and documenting every stage of delivery.

In many cases, the transfer of biological materials between clinics or scientific institutions in different countries is required. Therefore, the logistics plan is coordinated in advance, taking into account the requirements of airlines, customs authorities, and receiving organizations.

Cryogenic Transportation Technologies

Transportation in a cryogenic container can be carried out using two main methods, each with its own specific features. The choice depends on the nature of the cargo, the duration of the route, the requirements of the receiving organization, and the transportation conditions.

The following methods are commonly used:

1. transportation using liquid nitrogen;
2. transportation in specialized dry shipper containers.

Both methods maintain ultra-low temperatures, but they have different technical features, limitations, and areas of application.

Transportation in Liquid Nitrogen

Transportation of biological materials in liquid nitrogen involves the use of containers filled with liquid nitrogen. Samples are placed either directly in the liquid or in its vapor phase. This method reliably maintains ultra-low temperatures of approximately −196°C. However, its use in air transportation is limited because of the risk of liquid nitrogen spills and applicable safety requirements.

Dry Shipper Containers

Transportation in a dry shipper container is currently considered the most widely used method for international cryogenic logistics. Unlike conventional liquid nitrogen vessels, a dry shipper does not contain any free liquid. The nitrogen is absorbed in advance by a specialized absorbent material, which maintains a stable cryogenic environment inside the container.

This solution significantly reduces the risk of spills, simplifies cargo handling by airlines, and complies with the requirements of most international transportation services. As a result, dry shipper containers are widely used to transport embryos, oocytes, stem cells, and other biological materials over long distances.

What Is a Dry Shipper and How Does It Work?

A dry shipper is a specialized cryogenic container designed to transport biological materials without free liquid nitrogen. It uses a dry shipper system in which liquid nitrogen is retained by a porous absorbent material.

After the container has been charged with nitrogen, the nitrogen gradually evaporates, while the required temperature is maintained by the nitrogen vapor phase (vapor-phase nitrogen). This technology maintains temperatures below −150°C without allowing the samples to come into contact with the liquid phase. Samples are placed in sealed tubes, straws, or cryovials, which are then secured in protective canisters inside the container.

Depending on the model, a dry shipper can maintain the required temperature for anywhere from several days to several weeks.

Safety and Temperature Control

Cryogenic transportation of biological materials requires continuous temperature control. Even a brief deviation from the permitted parameters may affect the quality of the biological material. For this reason, modern transportation processes are based on a multi-level protection system.

During transportation, particular attention is paid to:

• checking the technical condition of the container;
• proper sample preparation;
• temperature monitoring;
• route monitoring;
• preparation of all accompanying documentation.

International air shipments must comply with IATA requirements. The UN 3373 standards may also apply when transporting certain categories of medical samples. Containers are certified, and logistics processes are designed to prevent temperature deviations and ensure full shipment traceability.

Electronic temperature data loggers and GPS tracking are also frequently used, allowing transportation conditions to be monitored almost in real time.

How Cryo Transportation Is Organized

Organizing cryo transportation and cryo transport requires several consecutive stages. Following the established procedure helps minimize risks and ensures the correct transfer of biological materials.

A typical process includes the following steps:

1. Preparation of the samples by the medical institution.
2. Verification of documentation and identification of the material.
3. Preparation of the dry shipper or another cryogenic container.
4. Placement of the samples inside the container.
5. Temperature verification before dispatch.
6. Handover to the carrier.
7. Route monitoring.
8. Delivery to the recipient.
9. Confirmation of receipt and inspection of the container’s condition.

At every stage, the internal protocols of medical institutions and international logistics requirements are followed to ensure that the required transportation conditions are maintained.

Comparison of Transportation Methods

Dry shipping in a dry shipper container is preferable for international and air transportation because of its safety and compliance with IATA requirements. Transportation in liquid nitrogen remains suitable for ground transportation and short routes where the risk of spills is minimal.