How to plan samples for a shelf-life study

Plan lots, packaging, time points and analysis methods with the laboratory in advance.

10 November 2024Updated 23 September 2026

Short answer

There is no universal sample count or number of test points. Define the product, lots, packaging, expected use conditions and the quality or safety endpoint. Agree sample numbers, timing and methods with a qualified laboratory and quality team before starting. Retain raw data and deviations; do not derive a use-by date or release decision from a curve alone.

A shelf-life study is planned around product variability and the evidence needed for a decision. There is no sample count that fits every product.

Write the study question. Define the product and production lots, package format, storage scenario, quality or safety endpoint, and analytical method. Without these, a sample or time-point count cannot guide a decision.

Build the sampling schedule with the laboratory

Set baseline, expected change period and decision point in the study plan; select independent lot/package samples and replicates with the laboratory's rationale. Record lot, time, conditions, method, device and result for each sample.

Archive raw results, deviations, sample preparation and transport conditions together. Have the authorised quality team review the study; a model curve alone is not a safe shelf-life or release criterion.

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Topics:Food quality and shelf life Measurement and traceability

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