The role of allergen analysis
The analysis of a material or surface for the presence and/or amount of an allergen is a valuable tool for a risk-based approach to allergen management. Analytical test results can provide assurance and verification of critical controls within a comprehensive allergen management plan, and confirm or refute the findings of a quantitative risk assessment.
Understanding the nature of the allergen – its form (powder, liquid, homogenous or particulate) and its behaviour in the food in which it is used – will play a major role in the choice of methodology applied.
Important:
Allergen analysis plays an important role in allergen management but is not a substitute for a robust allergen management program. A negative test ≠ allergen absence. Testing alone does not prove product safety or verify claims.
Remember:
The allergen may not be evenly incorporated into the batch, so the result only applies to the sample. The information you collect in your allergen risk review will provide the context needed to interpret what the results mean. Due to limitations in sampling, conclusions should never be drawn from test results alone.
Key definitions
Understanding what your test result means – and what it doesn’t mean – is as important as understanding the test method.
| Term | Meaning |
|---|---|
| Qualitative result | Indicates whether the allergen is present or absent – detected or not detected. Does not tell you how much allergen is present. |
| Quantitative result | Indicates the concentration, or how much allergen has been detected. Usually expressed as mg/kg or ppm. |
| LOD – Limit of Detection | The lowest quantity of allergen that can be distinguished from the background noise of the blank samples. A result below the LOD does not necessarily mean the sample is free of the allergen. |
| LOQ – Limit of Quantification | The lowest quantity that can be measured with acceptable accuracy and precision. A result reporting at LOQ provides more useful and more robust information and is the internationally accepted best practice. |
When to use allergen analysis
Allergen testing is appropriate in a range of situations across all stages of allergen management.
Raw materials
Confirm allergen status as part of a risk review or production release protocols.
Factory Allergen Risk Review
swabbing complex/challenging equipment, identifying potential hang up points or considering the impact of processing on the enviornment.
Validate cleaning protocols
Confirm that cleaning procedures remove allergen protein from equipment or line. Methodology must be robust and confirmed as suitable.
Verify the effectiveness of cleaning
- surfaces (equipment, utensils, environment)
- cleaning water (CIP rinse water)
- flush materials
Confirm the allergen status
Confirm the allergen status of your finished product risk assessment – cross contact allergen levels or vs proposed claims.
Analytical methods – which to use?
Currently ELISA (Enzyme-Linked Immunosorbent Assay) is considered the most robust method available for allergen protein analysis. The method detects intact proteins or groups of proteins. Other established methods may be used where ELISA methods are not available.
| Method | What it detects | Recommended use | Key limitations |
|---|---|---|---|
| ELISA (Enzyme-Linked Immunosorbent Assay) | Intact allergen proteins or protein groups | Best practice for most allergen analysis. Widely used, quantitative, most robust available. | May not detect allergens that have undergone fermentation or extensive heat processing, which can partially break down proteins. |
| PCR (Polymerase Chain Reaction) | DNA from allergenic source (not the protein itself) | Alternative where ELISA is not available. Use quantitative real-time PCR where possible. | Detects DNA, not allergen protein. A positive PCR result does not always mean allergenic protein is present at a harmful level. |
| LFD (Lateral Flow Devices, rapid test strips) | Presence/absence (qualitative only) | Rapid screening only. NOT recommended for validation or VITAL Program risk assessment purposes. | Cannot provide protein concentration data required for VITAL Program assessments or cleaning validation. |
| LC-MS, SDS-PAGE (Mass spectrometry / protein separation) | Specific proteins at very low levels | Specialist use for complex food matrices, e.g. confirming gluten absence in highly processed wheat derivatives. NOT recommended in routine situations. | Specialist laboratory capability required. Seek advice from your laboratory provider. |
Sampling for allergen analysis
How you sample is as important as which method you use. Poor sampling can undermine even the best analytical method.
Critical:
Do not use composite samples for allergen analysis. Compositing combining several samples into a single unit before testing can dilute allergen concentration, so the reported value does not represent the actual level in individual samples. This is particularly important when assessing incoming ingredients for allergen absence claims (e.g. gluten free, dairy free). Test samples individually wherever possible.
Best practice for sampling:
For cleaning validation, collect rinse waters where possible, they are more representative of the process than swabs alone. For ingredient testing, use random sample collection rather than systematic sampling, particularly for heterogeneous agricultural commodities where allergen distribution is uneven.
For more information on how to develop a sampling plan, see [sampling plan page — add link].
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Interpreting results
Detection is not the same as risk
Finding an allergen, or not finding one, does not automatically tell you whether a product is safe or unsafe. Analytical results must always be interpreted in context.
| Key point | What it means |
|---|---|
| Detection does not equal risk | A positive result means allergen protein has been detected, but the level may be too low to pose a risk to allergic consumers, depending on the amount present and how the food is consumed. |
| Non-detection does not equal absence or safety | A “not detected” result means the allergen is below the test method’s Limit of Detection (LOD) – not that it is completely absent. Small amounts may still be present. |
| Risk depends on dose and consumption | The likelihood of an allergic reaction depends on: – how much allergen is present (concentration), – how much of the food is eaten (portion size) and; – the sensitivity of the individual. If the test result is for cross contact allergen quantification purposes, the VITAL program can be used to determine labelling outcome (based on risk). |
| Test results represent only the sample tested | Allergen distribution may be uneven (e.g. particulate contamination). A single result cannot guarantee the status of an entire batch or production run. |
| Testing must be interpreted within a risk-based framework | If the test result is for cross contact allergen quantification purposes, VITAL Online can be used to determine the labelling outcome (based on risk). If analytical testing identifies allergen concentrations higher than expected from your VITAL Program risk assessment estimates, do not simply update the label – investigate the cause first. |
Key message
Allergen testing is a valuable tool for understanding your process – but risk decisions and labelling must be based on the outcome of your allergen risk review, not on test results alone.
Unexpected results
If analytical testing identifies allergen concentrations higher than expected from your VITAL Program risk assessment calculations, do not simply update the label – investigate the cause first.
Things to consider:
- The type of analysis used, and whether the correct ELISA kit was selected
- Whether ingredient specifications or supplier cross-contact data have changed
- Whether Hang Up assumptions remain valid following any equipment changes
- Whether cleaning has been validated recently, or whether cleaning chemicals or procedures have changed
In your workplace — allergen testing checks
These practical questions are for food business operators to apply in their own operations.
If a result comes back as “not detected”, this does not mean absent — it means below the LOD. Knowing the LOD matters for VITAL Program risk assessment inputs.
Validation confirms the procedure works in principle. Verification confirms it continues to work in practice. Both are required for a defensible allergen management program.
Environmental monitoring should run in parallel with microbiological monitoring — not be treated as a one-off exercise.
Lateral flow devices (LFDs) can only tell you detected/not detected — not how much. For any result informing a VITAL Program assessment or a labelling decision, you need a quantitative ELISA result from an accredited laboratory.