You can preserve and transport a biological sample without having a dedicated lab on site, but there is no safe, reliable method that works for every specimen. The receiving laboratory must specify the collection container, medium, temperature, time limit, documentation and shipping instructions for the intended test. If you cannot confirm those requirements—or lack the training to collect the specimen—do not collect or ship it.
How do you preserve biological samples without a lab?
Preservation means keeping a sample suitable for a particular analysis; it is not the same as making the sample safe to handle. Depending on the specimen and test, the lab may require a stabilizing medium, refrigeration, freezing or room-temperature handling. A condition that protects one analyte or organism can compromise another, so do not choose a method based on the word “biological” alone.
Confirm the test and the receiving lab’s instructions
Before collecting anything, contact the laboratory that will perform the analysis. Confirm all of the following, preferably in its current written instructions:
- Specimen type, collection method, container and required amount.
- Whether a transport or stabilizing medium is needed.
- Required temperature range and maximum time from collection to receipt.
- Required forms, identifiers, labeling and any chain-of-custody process.
- Whether the lab accepts this specimen, when it can receive it, and whether a weekend or holiday affects delivery.
- Packaging, shipping classification and carrier or transport-mode instructions.
CDC advises using test-specific storage guidance because general collection recommendations may not suit a requested test. Its field sampling guidance also cautions: “Do not collect samples without specific training in the collection procedure because the generalized guidance in this chapter might not be appropriate for a specific requested test.”
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Plan for people and field conditions
Collection can create exposure, contamination and waste-disposal risks. CDC recommends appropriate training and personal protective equipment, a risk assessment involving laboratory and relevant safety personnel, and a plan for decontamination and waste. If the collection procedure or risk controls are unclear, arrange for a trained collector rather than improvising.
Do biological samples need to be refrigerated or frozen?
Only the receiving lab’s instructions can answer that for a specific specimen and assay. CDC’s specimen-shipping job aid illustrates why: it treats frozen, refrigerated and room-temperature specimens as separate packing pathways. Its temperature ranges below describe that CDC aid, not universal requirements.
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| Pathway in CDC’s specimen-shipping aid | Handling described | What to confirm |
|---|---|---|
| Refrigerated | Specimens at 2–8°C; the aid describes cold packs and insulation. | The lab’s accepted range, time limit and packing method for this specimen and test. |
| Room temperature | The aid describes 15–25°C. | Whether room-temperature transit is permitted and how long the sample may be held. |
| Frozen | The specimen should already be at its required temperature before packing; the aid describes using dry ice around sealed secondary packaging. | The required specimen temperature, dry-ice quantity, carrier acceptance and applicable shipment rules. |
For a narrow example, CDC healthcare water-sampling guidance recommends cold transport at approximately 4°C and testing preferably within 24 hours. That advice applies to the water-sample context described by CDC, not to blood, tissue, swabs, cultures or biological samples generally. The same guidance considers 100 mL a suitable minimum for its context, while the actual volume depends on the assays requested.
How do you transport biological samples without a dedicated lab?
- Agree on the route before collection. Confirm the lab’s acceptance criteria, delivery hours, paperwork and maximum transit time. CDC recommends planning shipments to arrive on a weekday where possible; coordinate arrival before collecting if the lab may be closed.
- Prepare the specified materials. Use the container, medium and temperature-control method the lab requires. Consider outdoor temperatures, delays, available power or ice, and the expected route. Do not assume a household cooler or consumer specimen kit meets the lab’s requirements.
- Contain the specimen in layers. CDC field guidance calls for a sealed, leakproof secondary container and cushioning to reduce breakage. Use the primary receptacle, secondary containment and rigid outer packaging required for the specimen’s classification and transport mode. Packaging details are not interchangeable across shipments.
- Label and document it. Use at least two appropriate identifiers, and keep a line-list with collection and transport information. Include the forms required by the lab and applicable transport rules. If evidentiary integrity matters, ask the lab or local officials whether a chain-of-custody form is needed.
- Dispatch only when the shipment is ready and accepted. Check that containers are closed and intact. Disinfect exterior surfaces when appropriate without damaging labels, then verify the route, delivery timing and required paperwork. Do not send a potentially infectious specimen through an ordinary postal or courier service unless the shipment is permitted and prepared under the applicable rules.
What packaging is needed to ship a biological specimen?
Packaging must protect people and the specimen, and its exact requirements depend on the material’s classification and how it will travel. CDC’s shipping aid describes primary, secondary and rigid outer packaging. Its field guidance specifies a sealed, leakproof secondary container and cushioning; the receiving lab and applicable transport rules determine the full package and required markings, labels and documents.
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For frozen shipments, CDC’s cited job aid describes dry ice around the sealed secondary packaging, without direct contact between dry ice and the primary receptacle, and an insulated outer container with walls at least two inches thick. It gives an approximate dry-ice sublimation rate of 5–10 pounds per 24 hours and uses 5–10 pounds in an overnight-shipment example. Those figures belong to that guidance and example; they do not establish the right quantity for a different package, route or journey. Confirm the actual shipment’s temperature needs, package design, carrier acceptance and classification.
WHO’s 2025–2026 transport guidance addresses classification, packaging, marking, labeling, documentation, training and risk management, with the edition aligned to international rules applicable from 1 October 2025. CDC advises U.S. shippers to consult requirements for the relevant mode, such as applicable IATA, DOT or postal rules. Requirements can differ by jurisdiction and change over time, so check the rules that apply to the actual shipment rather than assuming a product or ordinary packaging is compliant.
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- Primary receptacle and medium specified by the lab.
- Sealed, leakproof secondary containment, with cushioning as required.
- Rigid, insulated outer packaging and temperature-control materials when the protocol calls for them.
- Required marks, labels and paperwork for the classification and transport mode.
A temperature logger may help monitor an appropriate route, but it is not established as a universal requirement. No generic cooler, bag or kit guarantees compliance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you do if the lab’s instructions are unavailable?
Pause rather than guessing at the temperature, medium, container or shipping category. Ask the intended laboratory for current instructions and confirmation that it will accept the sample. If the specimen may be infectious, do not collect or dispatch it without suitable training, risk controls and an approved transport plan. General guidance cannot establish a specimen’s holding time or guarantee that it will remain suitable for an unspecified assay.
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