An assay becomes useful for traceability only when its sample and method can be related to a particular lot and point in the lot's history. A PDF named after a customer is not enough.
Follow the sample chain
Record the sample identifier, parent lot, sampling time and location, collector and laboratory identifier. If composite or sub-samples were used, preserve those relationships. Note whether the result describes material before or after a processing step.
Retain the measurement context
The analyte, value and unit need the method, basis and laboratory report version. A result on a dry basis should not be compared casually with an as-received result. Store the original report separately from a structured measurement transcribed from it.
- Sample-to-lot link
- Method and measurement basis
- Value, unit and detection limits if stated
- Report version and review status
Treat unresolved matches as work
A laboratory sample code may not match the plant's lot code. Let a reviewer reconcile that mapping and record the evidence for the decision. Until then, show the assay as attached but not confirmed for that physical lot.
What this looks like in practice
Lab result L-203 names sample SP-9; the plant sheet maps SP-9 to a sub-sample of receipt R-18 before drying. A later output lot may be related through the transformation, but the assay should not be presented as a direct measurement of that output.
This guide does not prescribe sampling frequency, laboratory accreditation or analytical method suitability; those are domain-specific technical decisions.