Batch traceability is the ability to link a physical vial back through every step of its manufacture and testing. Without it, a research result cannot be reproduced and an out-of-specification result cannot be investigated.
The batch identifier as an anchor
Each production run receives a unique batch or lot number. That identifier appears on the vial label, on the certificate of analysis, and in the manufacturer's internal records. It is the single anchor that ties every downstream document back to the material in hand.
Retention samples
Reputable suppliers retain a small quantity of each batch under specified storage conditions for a defined period. If a question is raised months later, the retention sample can be re-tested and compared against the original release data. Without retained samples, a batch investigation stops at the paper record.
Archival records
Chromatograms, mass spectra, weighing records, and analyst signatures are archived for each batch. These raw records back up the summarised values on the COA and are the reference used if a discrepancy is reported.