What to do when a customer has a suspected allergic reaction.
A suspected severe food-allergy reaction is first an emergency and then an investigation. This practical UK guide explains how hospitality teams can respond immediately, preserve evidence, identify what went wrong and strengthen the allergen system afterwards.
Practical guidance from TKEG (The Kitchen Efficiency Group), built around everyday UK hospitality compliance and kitchen operations.
Treat a suspected severe allergic reaction as an emergency
A severe food-allergy reaction can become life threatening very quickly. If a customer appears to be having a severe allergic reaction, call 999 immediately and tell the emergency operator that you suspect anaphylaxis. Follow the instructions given by the emergency services.
Stay with the customer and make it easy for the ambulance crew to reach them. Food Standards Agency catering guidance also advises sending someone outside to meet the ambulance and guide responders to the customer.
Do not waste time trying to prove the cause first
Emergency care comes before investigating which ingredient may have caused the reaction. Staff should not delay the 999 call while checking recipes, packaging, allergen matrices or CCTV.
Once emergency help is on the way and the customer is being supported, management can begin preserving the factual information needed to understand what happened.
Preserve the food, packaging and order information
Do not immediately discard the meal, garnish, packaging, preparation labels or relevant ingredient containers if they may help establish what was served. Keep them secure and clearly separated from normal service so they cannot be reused accidentally.
Preserve factual information such as the table or order number, time of order, dishes supplied, customer allergy request, staff involved, recipe version, ingredient packaging, supplier details and any substitutions made that day.
Record exactly what was communicated
Allergen incidents often involve a chain of communication between the customer, front-of-house staff and the kitchen. Record what the customer told staff, what information staff provided, how the allergy request was passed to the kitchen and how the finished dish was identified at service.
Avoid rewriting the account to make it sound cleaner after the event. Contemporaneous factual notes are more useful for investigation and due diligence than assumptions about what probably happened.
Check whether the recipe or ingredient changed
A dish that was safe previously can become unsafe after a supplier substitution, recipe amendment, garnish change, different cooking oil, sauce change or replacement product. Compare the actual ingredients used during the service with the allergen information provided to the customer.
Do not rely only on the menu description. Check current labels, specifications, recipes and supplier information and establish whether any temporary substitution had been communicated and recorded.
Investigate allergen cross-contact as well as ingredients
The regulated allergen may not have been an intentional ingredient. Review preparation surfaces, utensils, fryer oil, grills, serving equipment, storage containers, handwashing and the sequence in which allergy meals were prepared.
If the kitchen could not reliably prevent cross-contact for the requested dish, that should have been communicated rather than guessed. FSA guidance says businesses should tell customers when they cannot provide a dish safely because cross-contamination cannot be avoided.
Decide whether other customers or food may be affected
If the investigation identifies incorrect allergen information, a wrongly labelled ingredient, supplier substitution or a preparation failure that could affect other meals, take immediate corrective action. This may include stopping sale of the dish, isolating affected stock, correcting menus or matrices and briefing the team before service continues.
Where a supplied food product itself appears to be incorrectly labelled or unsafe, traceability and withdrawal or recall procedures may also become relevant.
Cooperate with any local-authority or health investigation
A serious allergic reaction may lead to enquiries from environmental health, trading standards, public health or other authorities depending on the circumstances. Keep relevant records, ingredient information and factual staff accounts available.
Do not speculate about medical diagnosis or admit an unsupported cause. Cooperate fully and distinguish what is known from what is still being investigated.
Use the incident to strengthen the allergen system
After the immediate incident is controlled, review why the system failed or nearly failed. Possible causes include outdated matrices, weak recipe control, supplier substitutions, poor front-of-house communication, unclear allergy-meal identification, inadequate cleaning, shared equipment or staff uncertainty.
Corrective action should address the underlying cause rather than only remind staff to be more careful. Update procedures, records and training where needed and make sure the change is visible to the people who prepare and serve food.
How TKEG supports allergen incident evidence
TKEG (The Kitchen Efficiency Group) can keep allergen records, supplier information, deliveries, corrective actions, staff training and wider food-safety evidence together so management can investigate an incident and show what changed afterwards.
TKEG does not replace emergency medical assistance. A suspected severe allergic reaction requires immediate emergency action first.
Practical guidance, checked against official UK sources.
TKEG guidance is written for practical hospitality use. Where a topic involves regulation, official schemes or workplace safety, businesses should also consult the current guidance from the relevant authority and apply it to their own operation.
TKEG is independent and is not affiliated with or endorsed by the Food Standards Agency, HSE or a local authority. Official guidance and legal requirements take precedence where applicable.
Put the guidance through a practical check
Use our free interactive tools to assess inspection readiness, generate a tailored checklist, check temperatures, review training needs, test allergen and COSHH controls, or review your HACCP-based food-safety management system.
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Move between the core topic hubs to understand how food-safety records and controls connect.
Continue with closely related guidance
Food allergen requirements for restaurants
Read the TKEG guide.
Food safety complaints & suspected food poisoning
Read the TKEG guide.
Food safety corrective actions
Read the TKEG guide.
Food traceability records
Read the TKEG guide.
Food recall and withdrawal procedure
Read the TKEG guide.
Allergen management software
Read the TKEG guide.
Related TKEG software and workflows
TKEG helps hospitality teams record, manage and evidence many of the day-to-day controls covered in our guides.
Common questions
What should restaurant staff do if a customer may be having anaphylaxis?
Call 999 immediately, say that you suspect anaphylaxis and follow the emergency operator’s instructions. Stay with the customer and help emergency responders reach them quickly.
Should the restaurant keep the food after an allergic reaction?
Where practical, preserve the meal, packaging, ingredient labels, recipe and order information securely because they may help establish what was served and how the incident occurred.
Should we admit that the restaurant caused the reaction?
Do not speculate. Record the facts, support the customer, cooperate with any investigation and establish what ingredients, communication and preparation controls were actually involved.
What if the allergen was not listed as an ingredient?
Investigate possible cross-contact, supplier substitution, recipe changes, shared equipment, cooking oil, garnishes and incorrect or outdated allergen information.
Do we need to stop selling the dish?
If the incident suggests the dish, ingredient information or preparation process may be unsafe for other customers, stop and assess the affected food or process before continuing service.
Turn the paperwork into a working system.
TKEG brings food-safety records, compliance evidence and kitchen management together.