Traveling with Lab Samples (IATA Coolers)

To move lab samples by air, first classify the material, then choose packaging and coolant that meet the rules for that classification. PI 650 applies only to samples correctly classified as UN 3373, Biological Substance, Category B. Confirm the current IATA rules, airline requirements, route limits, and temperature needs before packing or tendering the shipment.

Air shipment can feel difficult because one familiar word, such as “sample,” does not tell you which rules apply. The useful change is to replace guesswork with a short sequence: classify, check the route, select tested packaging, pack, then verify. I use that order because a well-insulated cooler cannot correct a classification or containment error.

An “IATA cooler” is not a formal packaging category. The cooler is only one part of the completed package, and its insulation claims do not prove that the package meets an air-transport standard.

Plan the shipment: classification, route, and temperature

Classification identifies the transport category and determines which packing instruction and marks apply. Do not assume a clinical or research sample is UN 3373. Confirm the classification with the responsible shipper or dangerous-goods function before selecting a cooler or refrigerant.

First establish what is being transported, its physical form, and any known hazard. The relevant category may be Biological Substance, Category B (UN 3373), Category A, an exempt human or animal specimen, or another regulated substance. These categories are not interchangeable. PI 650 is for properly classified UN 3373 material, not a general-purpose method for every biological sample.

Next, check the current edition of the IATA Dangerous Goods Regulations (DGR), the airline’s variations, and rules for each country on the route. Acceptance can depend on the carrier, service, destination, and coolant. Ask the airline or its cargo agent whether it accepts the shipment and whether it imposes limits or requires advance arrangements.

Set the temperature range and transit time with the receiving laboratory. Include expected delays at transfer points, weekends, and customs. Choose a coolant and cooler based on the actual validated hold time, not a product’s broad marketing claim. If samples are time-sensitive, agree on a plan for delays with the shipper and recipient.

Key next step: Record the classification, route, required temperature range, transit duration, and carrier acceptance before packing.

Check packaging access, dimensions, and clearances

Packaging must protect the sample and meet the rules that apply to the shipment. For a liquid UN 3373 shipment under PI 650, containment, pressure resistance, and drop performance are key checks. The complete outer package must also meet the minimum dimension, even if the cooler alone seems suitable.

For liquids, use leakproof primary receptacles and leakproof secondary packaging. Place absorbent material between them in enough quantity to absorb all liquid if the primary receptacles leak. Secure the receptacles so they cannot shift or strike each other during handling. Then place the secondary packaging in a rigid outer package.

The primary receptacle or secondary packaging must withstand an internal pressure differential of at least 95 kPa (0.95 bar) without leakage. The completed package must withstand a 1.2 m drop test without leakage from the primary receptacle or receptacles. At least one external dimension of the completed outer package must be 100 mm or greater.

These are performance requirements, not features you can assume from a cooler’s material, insulation thickness, or brand. Use packaging with appropriate evidence for the intended use, and confirm that the assembled configuration is covered. Do not improvise by treating an insulated food box as tested dangerous-goods packaging.

Check	PI 650 requirement for applicable liquid UN 3373 shipments	What to verify
Primary and secondary containment	Both must be leakproof	Closures, compatibility, and secure placement
Absorbent	Enough to absorb all liquid contents	Total liquid volume, not just one vial
Pressure resistance	At least 95 kPa without leakage	Evidence for the primary or secondary packaging
Drop performance	1.2 m without primary-receptacle leakage	Evidence for the completed package
Outer dimension	At least one dimension is 100 mm or more	Measure the assembled outer package

Key next step: Confirm the assembled package, not just its components, meets the required performance and size.

Assemble the cooler and manage refrigerant

Packing means keeping the sample’s required containment intact while managing temperature and any refrigerant safely. The sample package and the space holding coolant have different jobs. A cooler may need to release gas from dry ice while the primary and secondary sample containers remain properly closed and leakproof.

Pack in a clean area and follow the packaging supplier’s instructions. Close each primary receptacle, place it inside the secondary packaging with adequate absorbent, and secure the assembly inside the rigid outer package. Add cushioning or dividers as needed to prevent movement. Keep the required labels visible after packing.

Dry ice is UN 1845, Class 9. It releases carbon dioxide gas as it warms, so a dry-ice package must allow gas to escape. Do not seal a dry-ice cooler gas-tight. Pressure can build and cause package failure. Venting the refrigerant space does not mean the sample itself can be left without the required leakproof primary and secondary containment.

Dry ice also brings separate marking and documentation duties. The package generally needs the dry-ice marking, net quantity declaration, and applicable Class 9 label under the current rules. Confirm carrier-specific quantity limits and acceptance requirements. Do not assume that adding dry ice makes a sample package compliant.

Other coolants, such as frozen gel packs, may have different transport requirements. Check what the coolant contains and how the carrier treats it. Secure coolant so it does not damage, displace, or compromise the sample packaging. Keep the intended temperature range in view: colder is not always suitable for every specimen.

Key next step: Use a vented configuration for dry ice, while maintaining intact, leakproof sample containment.

Verify containment, markings, and carrier acceptance

Final verification is a deliberate inspection before tender. It checks that the classification, package, coolant, marks, and transport documents agree. Requirements change by material, route, carrier, and current DGR edition, so use the shipper’s dangerous-goods process rather than relying on a generic cooler checklist.

For a correctly classified UN 3373 shipment, confirm the applicable PI 650 marks and required package information are present and legible. If dry ice is used, verify its separate marks, label, and net quantity declaration as required. Ensure that required marks are not hidden by straps, tape, or an outer sleeve.

Do not assume a Shipper’s Declaration for Dangerous Goods is always needed or never needed. The documentation depends on the material, packing instruction, coolant, and applicable rules. A trained shipper or carrier should confirm what documents and air waybill entries are required for the specific shipment. Also confirm whether the airline accepts the package on the planned service and route.

Before handover, check:

• The sample classification and packing instruction are confirmed.
• The carrier and route have been accepted.
• Closures are secure, and the outer package is intact.
• Liquid absorbent is sufficient for all liquid contents.
• The package meets applicable pressure, drop, and dimension requirements.
• Dry ice can vent, and its quantity and required markings are correct.
• Temperature controls and recipient arrangements are in place.
• Required documents match the package and current carrier instructions.

If a package is rejected, do not cover or alter a mark to try again. Ask the carrier or dangerous-goods contact what needs correction, then recheck the full package.

Key next step: Perform this inspection immediately before tender, after all coolant and outer packaging are in place.

Worked shipment scenarios

These examples are planning scenarios, not reports of actual shipments. They show how the same cooler can lead to different checks depending on the sample classification and refrigerant.

Scenario: liquid diagnostic samples classified as UN 3373. The shipper confirms classification and carrier acceptance, selects a PI 650-compatible package, and checks the 95 kPa, drop, and outer-dimension requirements. Each primary container is closed, separated by sufficient absorbent from other receptacles, and enclosed in leakproof secondary packaging. The rigid outer package is then marked as required.

Scenario: UN 3373 samples shipped with dry ice. The shipper completes the sample containment checks above, then separately confirms dry-ice requirements and airline limits. The cooler permits carbon dioxide to escape; it is not made gas-tight. Dry-ice marks, net quantity, and the required Class 9 label are checked against current rules.

Scenario: an unclassified or potentially higher-risk specimen. The shipper pauses before using PI 650. The responsible specialist determines whether the sample is Category A, exempt, or another regulated material and identifies the proper packing instruction. A familiar lab label or routine use does not establish transport classification.

The practical lesson is that insulation, sample containment, and regulatory classification are separate questions. Resolve each one before handover.

Frequently asked questions

Does every lab sample use PI 650?
No. PI 650 applies when the material is properly classified as UN 3373, Biological Substance, Category B. Other classifications have different requirements.

Can I use any insulated cooler?
No. Insulation helps manage temperature but does not prove regulatory performance. Check that the complete package meets the applicable containment and performance requirements.

What does the 95 kPa requirement mean?
For applicable liquid Category B shipments, the primary receptacle or secondary packaging must withstand an internal pressure differential of at least 95 kPa without leakage.

What does the 1.2 m drop test apply to?
The completed PI 650 package must withstand a 1.2 m drop without leakage from its primary receptacle or receptacles.

Does the cooler need to be at least 100 mm wide?
The rule is that at least one external dimension of the completed outer package must be 100 mm or greater. Measure the finished package.

Can I seal a dry-ice cooler airtight?
No. Dry ice releases carbon dioxide gas. The package must allow gas to escape while the sample’s required primary and secondary containment remain intact.

Does dry ice make the package compliant?
No. Dry ice is UN 1845, Class 9, and has its own requirements. It does not replace the sample’s required packaging, classification, or marks.

Can I carry the cooler as passenger baggage?
Do not assume you can. Passenger-baggage rules and carrier policies may differ from cargo acceptance rules. Ask the airline in advance and use an appropriate shipping channel for regulated material.

Do gel packs need the same markings as dry ice?
Not necessarily. Requirements depend on the coolant and its contents. Check the current rules and the airline’s instructions for the specific product.

Who should confirm the classification and paperwork?
The shipper’s trained dangerous-goods contact, compliance team, or carrier should confirm them. Classification should not be guessed from the sample’s everyday name.

A practical final check

A reliable shipment starts with classification, not cooler selection. Confirm the route and temperature plan, use packaging suited to the applicable instruction, manage refrigerant separately, and verify all marks and documents before tender. For UN 3373 liquids, keep the 95 kPa, 1.2 m drop, absorbent, and 100 mm checks on the packing checklist.

(This article was written by one of our staff writers, Steven Langford. Visit our Meet the Team page.)