A records-chain guide for buyers and sellers of used medical equipment, current as of September 2026. It is general information, not legal advice, and it does not guarantee that any particular lookup will succeed.
A serial number looks like a label. It is actually a key: it is what connects a physical device to everything recorded about it ¡ª its history, its maintenance, its software, its field actions and its transfers of ownership. Where that key is missing or mismatched, every other record in the pack becomes ambiguous, because none of them can be attached to the object being sold.
What serial traceability actually proves
Traceability is not a single fact; it is a chain. At its simplest, it proves that the records you have been given refer to the unit you are being offered. At its strongest, it lets you reconstruct where a device has been, who maintained it, whether any corrective action applies to it, and how it came to be in the seller’s hands.
What it does not do is certify condition. A unit with a complete and consistent records chain can still be worn out, and one with thin records can still be sound. The chain tells you what you can verify, which is a different question from what you will receive.
Serial numbers and unique device identification
Two identifiers coexist in medical device documentation, and conflating them causes confusion at acceptance. A manufacturer’s serial number identifies the individual unit and is usually the key that a service history is organised around. A unique device identifier, where a market requires one, is a structured identifier that can include the device model and production data, and on some devices the UDI label also carries lot or expiry information.
For a used-equipment purchase, the practical implications are straightforward: record the manufacturer’s serial number from the device itself, record the UDI or device identifier where the labeling carries one, and note which of the two each document in the pack refers to.
| Identifier | What it identifies | Where to find it |
|---|---|---|
| Manufacturer serial number | The individual unit | Device nameplate; service records |
| Device identifier (UDI) | Model and production information | Device labeling; packaging |
| Lot or batch | A production group, often for consumables | Item label; sterile packaging |
| Asset number | The owning organization’s internal record | Asset tag; hospital register |
The records chain
History
What can be reconstructed about where the device has been used or stored, and by whom. For equipment sold by an organization rather than a dealer, this is often the strongest part of the chain; for equipment that has passed through intermediaries, it is frequently the weakest.
Maintenance
Service events, preventive maintenance and any corrective work, recorded against the serial number. What matters is continuity and specificity: dated entries, the provider named, and the work described.
Transfer
How ownership has moved, and what documentation exists for each transfer. In cross-border transactions this is also where import and registration records attach, which is why the chain matters beyond maintenance.
Checking a serial before purchase
- Read the serial from the device itself and photograph the nameplate.
- Compare it with the invoice, the service records and any test documentation.
- Check whether the unit is subject to any current field action by model, then narrow to the specific unit’s scope.
- Ask the seller to explain any record that does not carry a serial number.
- Record the identifier set in your asset register when the unit is accepted.
Where the chain breaks
Three points break the chain most often, and knowing them lets a buyer look in the right place. The first is the transfer between organisations: equipment sold out of a hospital often carries a full internal history that stops at the point of sale, and the dealer’s records begin there. The second is pooled inventory, where units of the same model are stored and sold together and their paperwork slowly separates from the physical devices. The third is refurbishment or repair, where work is performed and recorded against a job number rather than a serial number.
Each has a different remedy. A broken transfer chain is closed by asking the seller to obtain the previous owner’s records, which is often possible and rarely asked for. Pooled inventory is resolved by requiring serial-specific photographs and serial-specific records before purchase. Job-number records are resolved by asking the workshop to confirm which serial the work was performed on ¡ª a question that is reasonable before the sale and awkward after it.
When traceability is missing
A missing chain is not automatically a reason to walk away, but it changes what you are buying. The remedies are the familiar ones: commission the verification you can perform yourself after delivery, price the uncertainty rather than arguing about it, and use the contract to tie acceptance to the checks you need. What should not happen is accepting the device as though the records existed.
Seller checklist
- Photograph the nameplate with the serial legible, before packing.
- Confirm that every record in the pack refers to this serial number.
- State plainly where records are missing rather than leaving a gap unexplained.
- Carry the identifier through the invoice, the packing list and the transport documents.
Questions buyers ask
Is the serial number enough to check for recalls?
It is the starting point. Many actions are defined at model level, and only some name individual serial numbers or lots. Start with the model, then establish which scope applies to this unit.
What if the service records carry a different serial?
Then the records belong to another unit until the seller shows otherwise. Treat the history as absent, and price the verification you will commission accordingly.
Should we keep the identifiers after purchase?
Yes ¡ª in the asset register, not only in the purchase file. Field actions and service questions arrive years later, and the identifier set recorded at acceptance is what makes them answerable.
Record the identifiers, match the records to them, and keep them with the asset. If you are buying or selling equipment and want the records that travel with a unit, ask HHG for the documentation on a specific item, or browse the current listings. Related reading: medical device documentation practices.