Practical Key Points for the Storage, Transportation, and Supply Chain Management of Biomedical Reagents

1. Basic Requirements for the Storage Environment of Biomedical Reagents

Biomedical reagents are available in many types and are highly temperature-sensitive. Common storage conditions include room temperature, a cool and dark place, refrigeration at 2–8°C, freezing at -20°C and below, ultra-low temperature storage at -80°C, and liquid nitrogen vapor-phase or liquid-phase storage. Storage temperatures outside the recommended range may lead to decreased enzyme activity, antibody denaturation, standard degradation, or microbial contamination. Therefore, matching sites and equipment is the foundation of reagent management.

When planning storage space, laboratories or warehouses need to configure corresponding equipment based on the reagent catalog and average daily turnover. Refrigeration and freezing equipment should maintain good ventilation and heat dissipation, and should avoid direct sunlight and proximity to heat sources. Areas with different storage temperatures should be clearly divided, and temperature monitoring points should be established.

2. Daily Monitoring of Cold Rooms and Refrigerators

Cold rooms, refrigerated cabinets, and ultra-low temperature freezers should be equipped with temperature recording or alarm devices. Temperature sensors should preferably be placed close to the actual reagent storage locations or in positions representative of the equipment's internal space. Monitoring frequency can be determined according to equipment stability and risk level. In general, records should be made at least daily, and important equipment can be continuously recorded with upper and lower limit alarms set.

When a temperature abnormality occurs, the scope of impact should first be assessed: which reagents are involved, the duration of the abnormality, and the upper or lower temperature limit. For temperature-sensitive active components, supplier recommendations may be consulted or small-scale performance testing may be conducted to decide whether continued use is appropriate. Recording the abnormality process and handling measures helps with subsequent traceability and improvement.

3. Packaging and Transport Validation

The transport stage is greatly affected by season, distance, transfer method, and loading and unloading time. Before transport, appropriate packaging solutions should be selected for biomedical reagents according to product temperature requirements, including insulated boxes, ice packs, dry ice, phase change materials, or liquid nitrogen tanks. Packaging validation usually needs to simulate the longer duration and ambient temperatures that may be encountered in actual transport, and test whether the temperature inside the box can be maintained within the required range.

A common practice is to conduct summer and winter baseline tests and record temperature change curves under different load quantities and different environments. Transport temperature recorders or temperature indicator labels can help determine whether excursions occurred during transit. For reagents requiring cold chain transport, temperature records should be checked upon receipt and retained as acceptance documentation.

4. Handover and Receipt in Cold Chain Logistics

Management blind spots are prone to occur during the handover stage of cold chain transport. The shipper, logistics provider, and receiver should clarify their respective responsibilities, including pre-cooling preparation, loading and unloading time limits, transit storage, and abnormality reporting. Before signing for receipt, the receiver should verify packaging integrity, temperature records, specification quantity, and expiry date. If dry ice or liquid nitrogen is used, attention should also be paid to safe handling and volatilization loss.

For biomedical reagents transported internationally or across regions, customs clearance and transfer times may be extended, so an appropriate insulation margin should be reserved. High-value or irreplaceable reagents may be shipped in batches to reduce losses caused by a single transport abnormality.

5. Inventory Management and Handling of Near-Expiry Items

Supply chain management focuses not only on transport but also on inventory turnover. Biomedical reagents usually have expiry limits. Excessive inventory can easily expire, while insufficient inventory may affect experiments or production. Reorder points can be set based on historical usage, procurement cycles, and safety stock. Information systems can automatically provide alerts for near-expiry items and stockout risks.

Near-expiry reagents should be labeled separately and used preferentially for non-critical tests, internal validation, or training. If a reagent has passed its expiry date, it generally should not be used for formal testing or production. Regular inventory counts and verification of location labels and storage conditions help identify discrepancies between records and actual stock or incorrect storage locations.

6. Supplier Admission and Performance Evaluation

The stability of the biomedical reagent supply chain is closely related to supplier capability. When selecting suppliers, their production or agency qualifications, warehousing conditions, transport capability, and after-sales response can be evaluated. For temperature-sensitive reagents, whether the supplier can provide full-process temperature records and standardized packaging is an important consideration.

Establishing a supplier performance evaluation mechanism and recording on-time arrival rate, damage rate, temperature qualification rate, and complaint handling helps continuously optimize supply channels. In particular, for key reagents with sole-source supply, regular communication on inventory and production plans is advisable to reduce the risk of supply interruption.

7. Safety and Emergency Plans

Biomedical reagents may involve flammable, corrosive, harmful, or biologically active substances. Safety management requirements should be followed during storage and transport, and spill containment trays, absorbent materials, protective gloves, and emergency eyewash devices should be provided. Areas where liquid nitrogen and dry ice are used should also be ventilated to prevent oxygen deficiency or frostbite.

Emergency plans should be developed for situations such as refrigerator failure, power outages, transport delays, and packaging damage. The content of the plans may include backup equipment, emergency contacts, transfer containers, and judgment criteria. Regular drills help enable rapid response in real incidents.

8. Informatization and TraceabilityModern supply chain management increasingly relies on information technology. Through barcode or RFID identification, the entire process information of reagents from warehousing and requisition to use can be recorded. Temperature and humidity monitoring systems can be integrated with warehouse management systems to enable automatic alarms and records for abnormalities. Data traceability not only improves efficiency but also provides a basis for problem investigation.

For in vitro diagnostic reagent manufacturers or clinical laboratories, traceability also helps meet quality system and regulatory requirements. Even for research laboratories, establishing basic ledgers can reduce duplicate procurement, optimize inventory structure, and enhance result reproducibility.