Batch Numbers and Product Traceability Explained

Health Canada's GMP guidance describes a batch or lot as a specific quantity expected to be homogeneous within defined limits. The identifier is a traceability tool, not a quality score by itself.

Two packages with different lot numbers may have separate production dates, raw materials, test results or expiry dates. Documentation should therefore be matched by lot rather than by product name alone.

Use the physical package as the starting point.

• Locate the lot or batch code printed on the sealed package.
• Find the same code on the certificate of analysis.
• Confirm the product name, strength and dosage form also match.
• Review testing and approval dates for that batch.
• Keep the certificate with the package until the contents are gone.

Traceability makes it possible to investigate a complaint, isolate a documentation error or identify the scope of a recall. A product name alone is too broad because the same product can be manufactured across many batches.

Health Canada states that finished drug batches must be tested against written specifications before sale, subject to the regulatory framework and applicable testing provisions.

Do not assume a certificate for a nearby batch is equivalent. Ask the supplier for the document corresponding to the exact code on the package. If the mismatch cannot be resolved, do not rely on the certificate as evidence for that unit.