What is a LOT (lot number or batch number)?
A LOT (or lot number, also referred to as a batch number) is a unique identification code assigned to a specific production unit, batch or series of products that have been produced under identical conditions.
A LOT makes it possible to trace the origin, production and distribution of a product.
LOT numbers are crucial in sectors such as food, pharmaceuticals, chemicals and manufacturing for quality control, recalls and certification.
🎯 What does a LOT number contain?
Depending on the sector, a LOT number may refer to:
- Production unit or batch
- Production date or time
- Production line or location
- Raw materials or supplier code
It is often linked to data such as:
- Serial number (for individual identification)
- GMP dossiers
- LIMS results
- WMS locations
🧱 Example of a LOT system
| LOT number | Meaning (example) |
|---|---|
| LOT2319A | Year 2023, week 19, shift A |
| 2024-05-B001 | Production date + batch sequence number |
| 500183745 | Internally generated unique code |
🏭 Why are LOT numbers important?
| Purpose | Application |
|---|---|
| Traceability | Trace origin and distribution through the supply chain |
| Quality assurance | Link to test results, release or rejection |
| Recall management | Quickly and precisely recall products in case of deviations or incidents |
| Regulation | Required under GMP, FDA, ISO 9001, HACCP etc. |
🔗 LOT vs. other identifiers
| Code | What it identifies |
|---|---|
| Serial number | Individual product (single item) |
| LOT number | Group of identical products or batch |
| SSCC | Logistical unit (box, pallet) |
| UDI-PI | Production information for medical devices |
📌 In summary
A LOT number identifies a group of products from the same production unit and is essential for traceability, quality control and legal compliance.
It allows organisations to produce and supply safely, transparently and in compliance with regulations.