How to Set Up Batch Numbering and Traceability
A batch number is useless unless it leads somewhere. The system is the records it connects to, not the number itself. Design the number to be unambiguous, then build the links from it to materials, tests, stock and customers.
What Traceability Actually Requires
This guide is for brand owners and small manufacturers in India setting up a traceability system.
Traceability means that given a batch number you can establish, within a reasonable time, what went into that batch, what tests it passed, how much was made, and where every unit went. And given a raw material lot, you can establish which batches used it.
The batch number is only the key. The system is the set of records it unlocks and the links between them. A perfectly designed number with no retrievable records behind it provides nothing.
Most small operations have the records but not the links: the batch record is in one file, the test results in another, the dispatch details in a third, and connecting them takes days. The work here is building the connections, not inventing a clever numbering scheme.
Designing the Number
Simple and unambiguous beats clever.
| Principle | Why |
|---|---|
| Unique across all products and all time | Two batches sharing a number destroys traceability |
| Never reused | Including after a product is discontinued |
| Encodes the manufacturing date | Or links unambiguously to it |
| Identifies the product | So a number alone is informative |
| Short enough to print clearly | And to be read off a pack by a consumer |
| Avoids ambiguous characters | Confusion between similar-looking characters causes errors |
| Consistent format | So any number is recognisable as one |
| Documented convention | Written down, so it survives staff changes |
Write the convention down and keep it with your quality records. A numbering scheme that exists only in one person’s head is a single point of failure, and the person who designed it will not always be the person reading it.
The Links You Must Build
Each is a record connecting the batch to something.
Batch to Materials
Every raw material and packaging lot used, with supplier and the lot’s own certificate of analysis. This is the backward link.
Batch to Tests
In-process checks and finished product results, with the release decision and who made it.
Batch to Quantity
Produced, released, rejected, retained as samples and dispatched. The numbers should reconcile.
Batch to Customers
Every dispatch with customer, quantity and date. This is the forward link, and the one most often incomplete.
The reconciliation point matters. Produced quantity should equal released plus rejected plus retained plus any documented loss. A reconciliation that does not balance means a record is missing, and finding that during a routine check is far better than during a recall.
Records to Keep and For How Long
With professional advice on the applicable periods.
- Batch manufacturing record, including materials, quantities and process steps.
- Raw material and packaging lot certificates of analysis.
- In-process check results.
- Finished product test results with methods.
- Release decision with the name of the person authorising it.
- Quantity reconciliation.
- Retention sample log, with location.
- Approved artwork version used for that batch.
- Dispatch records with customer, quantity and date.
- Any deviation or investigation relating to the batch.
- Complaint records referencing the batch.
- Retain each for the period your professional adviser identifies, typically beyond shelf life.
The Forward Link Problem
This is where most systems fail.
Backward traceability is usually adequate, because the batch record is created during manufacture and names the materials used. Forward traceability is weaker, because dispatch happens over weeks and the records live in sales or accounts rather than quality.
The fix is to record the batch number at dispatch, on every dispatch, for every customer. That means the batch number appears on the dispatch document, not only on the pack.
Where you ship mixed batches to one customer, record the quantity of each batch separately. A dispatch document saying 200 units without batch breakdown tells you nothing when one of those batches is in question.
And where your customers are distributors, agree that they maintain their own onward records. Your traceability ends where their records begin, so that obligation belongs in the distributor agreement.
Checklist
Setting up or auditing your system.
- Design a number that is unique across all products and never reused.
- Encode or unambiguously link the manufacturing date and product.
- Avoid ambiguous characters and keep it printable.
- Write the convention down and keep it with quality records.
- Link each batch to every raw material and packaging lot used.
- Link each batch to its in-process and finished test results.
- Record the release decision and who authorised it.
- Reconcile produced, released, rejected, retained and dispatched quantities.
- Log retention samples with their location.
- Record the artwork version used for each batch.
- Record the batch number on every dispatch document, per customer.
- Record batch quantities separately where a dispatch mixes batches.
- Require onward records from distributors in the agreement.
- Retain records for the period your adviser identifies.
- Test the system with a mock trace and time it.
- Fix whatever the trace could not find.
Need a Manufacturer With Real Traceability?
Ask our team what batch records, reconciliation and retention samples you receive before you place a first order.
Frequently Asked Questions
What does traceability actually require?
That given a batch number you can establish what went into it, what tests it passed, how much was made and where every unit went, and that given a raw material lot you can establish which batches used it. The number is only the key; the system is the records it unlocks.
How should I design the batch number?
Unique across all products and never reused, encoding or unambiguously linking the manufacturing date and product, short enough to print clearly, avoiding ambiguous characters, in a consistent documented format kept with your quality records.
Which link is usually weakest?
Forward traceability to customers, because dispatch happens over weeks and the records sit in sales or accounts rather than quality. Record the batch number on every dispatch document per customer, with quantities broken out where a dispatch mixes batches.
What is quantity reconciliation?
Checking that produced quantity equals released plus rejected plus retained samples plus documented loss. A reconciliation that does not balance means a record is missing, and finding that in a routine check is far better than during a recall.
How do I know the system works?
Run a mock trace from a real batch number and time it. If you cannot produce the full material, test, quantity and customer picture within a few hours, the links are missing. Then fix whatever the trace could not find.