Lot numbers connect a physical research material to the records associated with the batch it came from. A clear lot system makes it easier to identify what was received, when it arrived, which supplier provided it, and which documents belong to it.
What a useful lot identifier should do
A lot identifier should be unique, readable, and consistent. It does not need to describe every detail on the label. Its main job is to point to a reliable internal record.
- Unique: one identifier should refer to one defined batch.
- Readable: avoid characters that are easily confused, such as O and 0.
- Consistent: use the same format across receiving records, vial labels, inventory, and documents.
- Permanent: do not recycle a lot number after inventory is exhausted.
What to record when a batch arrives
A basic receiving record can include the internal lot number, product name, labeled quantity, quantity received, supplier, supplier batch reference, purchase date, received date, and the name of the person who checked the shipment. Record the condition of the package and keep any supplier documentation with the same lot entry.
Labeling individual vials
Each vial should carry the product name and internal lot number. A small machine-readable code can also link to an internal record, but it should supplement readable text rather than replace it. A date on the vial can be useful when its meaning is clear, such as received month and year. It should not be presented as an expiration date unless supported by appropriate stability information.
Connecting documentation
Any supplier document, testing document, photograph, or receiving note should use the exact same lot identifier. If a Certificate of Analysis becomes available, it should be matched by supplier batch or lot reference before it is associated with inventory.
A simple lookup workflow
- Read the lot number on the vial.
- Search the internal lot record.
- Confirm the product, receiving date, supplier reference, and inventory entry.
- Open only documents explicitly linked to that lot.
Traceability improves recordkeeping, but it is not itself proof of identity, purity, or suitability. Those conclusions require appropriate supporting documentation and test methods.