Clinical sample management in practice: keeping consent, chain of custody and the coding key straight from collection to destruction, and the records that decide whether a human sample may still be used

What the system has to hold

1. The consent, and what it actually permits. Record the protocol, the approving committee and the scope of the consent against the sample, not against the study folder. The question asked later is always about one sample and one proposed use, and a system that cannot answer it forces a conservative no.
2. Coded, not anonymised, and know the difference. A coded sample can be linked back to the donor through a key held separately; an anonymised one cannot. That distinction decides which regulations apply and whether results can ever be returned. Record which one each sample is, and who holds the key.
3. Custody as structured data. Every transfer with who released it, who received it, when and at what temperature. Custody that lives on paper forms scanned into a folder cannot be queried, and it is queried exactly when a shipment arrives warm and somebody has to decide whether the material is usable.
4. Storage location down to the position. Freezer, rack, box, position, with the temperature history of that freezer alongside. A sample whose location is a freezer number is a sample somebody will spend forty minutes finding with the door open, and the excursion that causes is real.
5. The end of life, planned at the start. Consent usually has a horizon and protocols specify destruction or return. Record the disposition date at accession and act on it. Indefinite retention of human material nobody has a current permission for is the failure that surfaces in an audit.

Shipping human material

Category B biological substance packaging, a temperature logger in the box and a receipt condition record are the practical requirements. The logger matters most: a shipment that arrived warm and was accepted without a decision being recorded is an unresolved question attached to every result from it.

Agree in advance what happens to an out of range shipment, and who decides. A courier delay at a weekend is not the moment to be inventing the rule.

Working with a biobank or a central laboratory

Ask who owns the samples, who may authorise a new use, what happens at the end of the contract and whether material may be transferred. These are ordinary contract terms that become urgent only when a study ends or a collaboration changes.

Reconcile inventories on receipt and periodically after. Discrepancies between a site's manifest and a central laboratory's accession list are common and much cheaper to resolve in the first week.

Returning results, and when you cannot

Whether an incidental finding can be returned depends on the consent and on whether the sample is re-linkable. Decide the policy before the first sample is collected, because deciding it afterwards means deciding it about a real person.

If results may be returned, the analysis has to be performed in a laboratory qualified to issue them. A research assay result is not a clinical result, however good the assay is.

Common questions

What does clinical sample management have to record that research sample management does not?

The consent and its scope, the coding status and who holds the key, the chain of custody as data, and the planned disposition. Those four answer the only question that matters later: may this sample be used for this.

Coded or anonymised?

Coded samples can be re-linked through a separately held key and remain identifiable in regulatory terms. Anonymised samples cannot be re-linked at all, which removes obligations and also removes the ability to return a result or add a clinical variable later.

Do we need a separate system from the research LIMS?

Not necessarily, but the consent, custody and disposition fields have to exist and be enforced. A research system with those added as free text will not stop a sample being used outside its consent, which is the whole point.

How long should samples be kept?

For as long as the protocol and the consent permit, and no longer. Record the date at accession, review it on schedule, and document the destruction. Keeping material because it might be useful is not a retention policy.

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