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Laboratory research depends on the quality and stability of the materials being studied. Biological research materials can change when they are exposed to unsuitable temperatures, repeated temperature changes, moisture, light, contamination, or incorrect handling. For this reason, proper storage and handling are important parts of maintaining reliable laboratory work.
Biological research materials can include peptides, proteins, nucleic acids, cells, tissues, biological fluids, and other research specimens. Each material may have different storage requirements, so there is no single temperature or storage method that is appropriate for every type of research material. Researchers should always follow the storage instructions provided for the specific material and the requirements of the relevant experimental procedure.
A well-organized laboratory handling and storage system helps protect sample integrity, maintain accurate records, reduce unnecessary sample loss, and support reproducible research.
Biological materials can be sensitive to their surrounding environment. Changes in temperature, exposure to light, moisture, oxygen, or repeated handling may affect the physical or chemical characteristics of a material.
For example, some research materials require refrigeration for short-term storage, while others may require freezing or ultra-low-temperature storage for longer periods. The appropriate conditions depend on the type of material, its intended use, how long it will be stored, and the biological components that researchers need to preserve.
Storage conditions are therefore not simply a matter of keeping samples cold. The goal is to maintain the condition of the material for as long as reasonably possible under the conditions required for the research.
For biological specimens, published laboratory guidance emphasizes that storage requirements can vary considerably depending on the specimen and the intended analysis. (NCBI)
Laboratories may store many different types of biological materials. Common examples include:
Each category can have different handling requirements. For example, nucleic acids, proteins, viable cells, and tissue samples do not necessarily respond to temperature changes in the same way.
This is why researchers should avoid applying one general storage rule to every material in a laboratory.
Temperature is one of the most important factors in biological material storage.
Lower temperatures can slow chemical and biological processes that may otherwise affect a sample. However, the appropriate temperature depends on the material and the purpose of the research.
Some materials may be stored at controlled room temperature, while others require refrigeration. Certain materials may need freezer storage, and some long-term biological collections use ultra-low-temperature freezers or cryogenic storage.
For example, specific specimen guidelines may recommend refrigeration at approximately 2–8°C for temporary storage, while other materials may require storage at -20°C, -80°C, or lower temperatures. These temperatures should not be treated as universal requirements because the correct condition depends on the specific material and research protocol. (CDC)
Researchers should therefore check the product documentation, laboratory SOP, study protocol, or test-specific instructions before deciding where a material should be stored.
Refrigerators are commonly used for materials that require controlled cold storage but do not need to remain frozen.
A laboratory refrigerator should be monitored to make sure its temperature remains within the required range. Samples should also be arranged in a way that allows researchers to identify and retrieve them without unnecessary handling.
Overcrowding should be avoided because it can interfere with temperature distribution and make sample management more difficult.
Different materials may also need separate storage areas depending on laboratory procedures and safety requirements.
Freezers are used when materials need to remain frozen for short-term or long-term preservation.
Different freezer temperatures may be appropriate for different materials. Some research samples may be maintained around -20°C, while long-term preservation of certain biological materials may use ultra-low freezers at approximately -80°C or cryogenic systems.
Freezer storage also requires planning for equipment failure. A freezer malfunction or prolonged power interruption can potentially affect valuable research materials.
For this reason, laboratories may use temperature monitoring systems, alarms, backup equipment, emergency storage arrangements, or other contingency procedures.
NIH biospecimen guidance emphasizes the importance of freezer monitoring, inventory tracking, and appropriate backup planning for biological sample collections. (NHLBI, NIH)
Temperature stability can be just as important as the target storage temperature.
Repeated warming and cooling can be problematic for some biological materials. For certain samples, repeated freeze-thaw cycles can affect sample integrity and the quality of subsequent research.
One approach used in laboratory sample management is to divide suitable materials into smaller aliquots before long-term storage. This can reduce the need to repeatedly remove and thaw an entire sample when only a small quantity is required.
Whether aliquoting is appropriate depends on the material and research protocol, so researchers should follow the applicable SOP and manufacturer’s instructions.
Correct labeling is a basic but essential part of laboratory storage.
A sample should be identifiable throughout its storage period. Depending on the laboratory’s procedures, labels and records may include information such as:
Accurate identification reduces the risk of samples being confused or incorrectly assigned.
Laboratory guidance also emphasizes maintaining appropriate documentation and tracking systems for biological specimens. (CDC Stacks)
Good organization makes research materials easier to locate and helps reduce unnecessary handling.
Freezers, refrigerators, cabinets, and other storage areas should have a logical organization system. Samples can be arranged using boxes, racks, shelves, or designated storage locations.
A laboratory inventory system can also record the exact location of each sample.
For larger research collections, laboratory information management systems can help researchers track sample identification, storage locations, retrieval, and other important information. NIH biospecimen facilities use inventory tracking and freezer monitoring as part of biospecimen management. (NHLBI, NIH)
An organized storage system can also make it easier to identify missing samples, expired materials, or materials approaching their recommended storage period.
Contamination can compromise research materials and potentially affect experimental results.
Samples should be handled using appropriate laboratory procedures and suitable containers. Containers should remain properly closed when they are not being used.
Where applicable, laboratories should use leak-resistant or leakproof containers and follow their established biosafety procedures.
The appropriate precautions depend on the material being handled. Biological materials that present specific hazards require additional controls based on laboratory risk assessment and applicable procedures.
The CDC and NIH emphasize a risk-assessment approach to laboratory biosafety rather than treating every biological material as having identical handling requirements. (CDC)
Removing a sample from storage is another point where careful handling matters.
Researchers should know which sample they need before opening a freezer or refrigerator. This reduces unnecessary exposure of other materials to changes in temperature.
When retrieving samples, researchers should verify the sample identification before removing it from its storage location. After use, the material should be returned or processed according to the relevant laboratory procedure.
If a sample requires a specific temperature during handling, that requirement should be considered throughout the workflow rather than only during long-term storage.
Temperature monitoring is an important part of laboratory storage management.
A laboratory may use thermometers, digital monitoring systems, temperature data loggers, alarms, or other systems to identify storage conditions that move outside the required range.
Regular monitoring can help researchers identify problems before they result in significant sample loss.
For important biological collections, continuous monitoring and documented response procedures can provide additional protection against equipment failure.
Laboratory guidance recommends monitoring storage conditions and maintaining appropriate records because storage requirements are part of overall specimen quality management. (CDC Stacks)
If a refrigerator or freezer moves outside its required temperature range, researchers should follow the laboratory’s established deviation or incident procedure.
The first step is generally to determine what happened, how long the material may have been exposed to unsuitable conditions, and which materials may have been affected.
The laboratory should then assess the situation according to the relevant SOP, product documentation, and research requirements.
Not every temperature excursion automatically means that a sample is unusable. The effect depends on the material, the temperature reached, the duration of exposure, and the specific research application.
For this reason, researchers should document storage deviations rather than making assumptions about sample quality.
Good laboratory storage is closely connected to good record keeping.
A useful storage record can help answer important questions such as:
Maintaining these records supports traceability and makes it easier for researchers to understand the history of a material.
For research organizations managing large collections, detailed tracking can also improve sample retrieval and reduce the risk of losing valuable biological materials. (NHLBI, NIH)
A laboratory handling guide usually brings together the information researchers need to work with a particular material safely and consistently.
Depending on the material, the guide may cover:
The exact contents should be appropriate for the material and the laboratory’s risk assessment and procedures.
Storage requirements do not stop when a material leaves the laboratory.
If biological research materials need to be transported, their required temperature and packaging conditions should be maintained throughout the journey.
The correct packaging method depends on the material, its classification, destination, and applicable transport requirements.
For some biological specimens, laboratories use temperature-controlled packaging, insulated containers, cold packs, frozen refrigerants, or dry ice as appropriate. CDC guidance emphasizes that storage and shipping conditions should be determined according to the specific specimen and test requirements. (CDC)
Researchers should therefore check the applicable shipping and handling requirements before transporting biological materials.
A simple storage routine can help laboratories maintain better control over their research materials.
Important practices include:
These practices help create a consistent approach to sample management.
Proper handling and storage are essential parts of laboratory research. Biological materials can be sensitive to temperature, environmental conditions, contamination, and repeated handling, making appropriate storage an important factor in maintaining sample integrity.
There is no single storage condition that applies to every biological research material. Peptides, proteins, nucleic acids, cells, tissues, and other specimens may require different conditions depending on their characteristics and intended use.
A reliable laboratory storage system combines appropriate temperature control with accurate labeling, organized inventory management, monitoring, documentation, and suitable handling procedures.
By following material-specific instructions and established laboratory protocols, researchers can reduce unnecessary sample loss and maintain better control over biological research materials throughout their storage and use.
Note: Storage and handling requirements should always be determined from the specific material’s documentation, laboratory SOP, research protocol, and applicable safety requirements. The information in this article is general laboratory guidance and does not replace material-specific instructions.
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