Food allergy assessment and management
A specialist assessment to find out which foods cause your or your child's allergic reactions, followed by a plan to avoid them safely and treat any reactions.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Assessment identifies which food causes reactions and whether it is immediate (IgE) or delayed (non-IgE) allergy, which need different tests.
- A positive skin or blood test alone does not prove allergy; results must be read alongside the history, and an oral food challenge is the most definitive test.
- Management means safe avoidance, an emergency plan, and carrying adrenaline auto-injectors where there is a risk of anaphylaxis.
- Some childhood food allergies are outgrown, so review matters; home and high-street allergy or intolerance kits are unreliable and not recommended.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Identifies the food responsible and the type of allergy, so management is correct
Symptoms point to food intolerance rather than allergy, where allergy testing is the wrong test.
History and any skin tests are completed in one visit; skin-test bumps fade within an hour or two.
A clear written management and emergency action plan shared with your GP.
History and any skin tests are completed in one visit; skin-test bumps fade within an hour or two.
The food is given in rising amounts while you are watched. Report any itch, swelling, wheeze, tummy upset or...
You stay in the clinic for a monitoring period so any late reaction can be treated quickly.
You follow the avoidance and emergency plan, learn label-reading, and adjust the diet with dietitian help if...
What is food allergy assessment and management?
Food allergy assessment is a specialist process to work out whether symptoms are caused by a food allergy, which food is responsible, and how to manage it safely. It is led by a careful history of what was eaten, what happened and how quickly.
Food allergy is not the same as food intolerance. Allergy involves the immune system. Immediate (IgE-mediated) allergy causes fast reactions such as hives, swelling, vomiting or, at worst, anaphylaxis. Delayed (non-IgE-mediated) allergy causes slower symptoms such as eczema, reflux or tummy upset, and has no reliable single test, so it is often diagnosed by carefully removing and reintroducing a food.
Tests such as skin prick tests and blood tests for specific IgE help support the diagnosis, but they are interpreted alongside the history; a positive test alone does not prove allergy. The oral food challenge, giving the food in increasing amounts under supervision, is the most definitive test.
Management focuses on avoiding the food, recognising and treating reactions (including carrying adrenaline auto-injectors where needed), and reviewing over time, as some childhood allergies are outgrown.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Food allergy vs food intolerance
| Food allergy | Food intolerance | |
|---|---|---|
| Immune system involved | Yes | No |
| Typical symptoms | Hives, swelling, vomiting, anaphylaxis | Bloating, wind, loose stools, discomfort |
| Speed | Often fast (immediate type) | Usually slower |
| Risk of anaphylaxis | Possible | No |
They are managed very differently, so getting the right diagnosis matters. Intolerance is not tested with allergy blood tests.
Preparing for your treatment
- Keep a food and symptom diary: what was eaten, the symptoms, how soon they started and how long they lasted.
- Bring details of all reactions, any treatment used (including adrenaline auto-injectors), and a list of medicines and supplements.
- Bring information about other allergic conditions such as eczema, asthma or hay fever.
- Stop antihistamines for the number of days the clinic advises if skin testing is planned, as they hide reactions.
- For children, a parent or carer should attend and bring growth or feeding information if relevant.
- If an oral food challenge is planned, expect a long supervised appointment and follow any fasting or medicine instructions given.
What happens
The specialist takes a detailed history, which guides everything else. Skin prick tests may be done on the forearm or back and read after about 15 minutes, and blood may be taken for specific IgE.
For suspected delayed allergy, you may be advised to remove a food for a set period and reintroduce it carefully, often with a dietitian to keep the diet balanced.
If the diagnosis is still unclear, or to check whether an allergy has been outgrown, an oral food challenge may be arranged. The food is given in small, increasing amounts under close supervision, with staff ready to treat any reaction. If symptoms appear, the challenge is stopped and treated. You then leave with a clear management plan, which usually covers avoidance, label-reading, an emergency plan and, where needed, adrenaline auto-injectors.
Is this treatment right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Symptoms point to food intolerance rather than allergy, where allergy testing is the wrong test.
- Testing is requested for many foods with no supporting history, risking false positives and over-restriction.
- An oral food challenge is unsafe because of a recent severe reaction or unstable asthma.
- Unproven tests (such as IgG, hair or vega testing) are being relied on, which can mislead.
Delay or rearrange if…
- There is an active infection, fever, or flare of asthma or eczema.
- Antihistamines have been taken recently and skin testing is planned.
- Asthma is poorly controlled, which makes a food challenge riskier.
- You cannot stay for the monitoring period after a challenge, or get urgent help at home.
Alternatives to discuss
- Careful, dietitian-supported elimination and reintroduction for suspected delayed allergy.
- Watchful management with an emergency plan where the diagnosis is clear from history.
- Assessment through the NHS allergy pathway if private speed is not needed.
- Avoiding unproven tests and focusing on history-led assessment.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Identifies the food responsible and the type of allergy, so management is correct
- Distinguishes true allergy from intolerance, avoiding unnecessary food restriction
- Provides a clear emergency plan and, where needed, adrenaline auto-injectors
- Reduces anxiety by clarifying what is and is not safe
- Allows safe reintroduction when a challenge shows an allergy has been outgrown
- Supports a balanced diet, especially in children, with dietitian input
Risks & complications
- Itching or a small weal where skin tests are done
- Mild symptoms during an oral food challenge
- Over-restriction of the diet if avoidance is not guided properly
- The inconvenience and anxiety of a supervised challenge
- A more noticeable allergic reaction during a challenge needing medicines
- False reassurance or false alarm from a test result read without the history
- Nutritional gaps if several foods are excluded without dietitian support
- Anaphylaxis during an oral food challenge, needing adrenaline and emergency care
- A severe reaction to an accidental exposure outside the clinic
The most serious risk is anaphylaxis, either during an oral food challenge or from accidental exposure in daily life. Oral food challenges are therefore done under supervision with treatment ready, never at home. A second, quieter risk is over-restriction: cutting out foods without good evidence can harm nutrition, especially in children, and unproven tests can drive this. Ask which foods truly need avoiding, how to recognise and treat a reaction, and when reassessment is due.
Published figures to discuss
Skin and blood tests are interpreted with the history because positive results can occur without clinically important allergy, and negative results do not always exclude it. The main safety concern is anaphylaxis during an oral food challenge or from accidental exposure; its likelihood depends on the individual and the food, so reliable single percentages are not meaningful and challenges are kept to supervised settings.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Positive food IgE or skin test without true food allergy | Common, especially when broad panels are used without a clear history | Testing should be targeted to foods that plausibly caused symptoms; otherwise false positives drive unnecessary avoidance. | Guide sourcesClinical context |
| Food allergy and asthma together increasing severe-reaction risk | Clinically important and repeatedly recognised in guidance | Asthma control is part of food-allergy safety, not a separate issue. | NICE CG116 — food allergy in under 19s: assessment and diagnosisnice.org.ukSource-linked context |
| Nutritional harm from multiple food avoidance | Common enough to justify dietitian input, especially in children | Avoidance plans should protect growth, calcium, iron, protein and quality of life. | Guide sourcesClinical context |
| Cofactor-dependent reactions | Uncommon but important | Exercise, alcohol, NSAIDs, illness or menstruation can lower the reaction threshold for some people. | Guide sourcesClinical context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
Most of this is about ongoing management rather than physical recovery. After an oral food challenge you are observed for a period because a reaction can begin or return after the last dose.
- Small, itchy skin-test bumps that settle within an hour or two
- Feeling tired or anxious after a long challenge appointment
- Getting used to label-reading and carrying emergency medicines
- No change in symptoms if the assessment confirms a food is safe
Aftercare
- Follow the avoidance advice and learn to read ingredient labels for hidden allergens.
- Carry your emergency medicines, including any adrenaline auto-injectors, and check expiry dates.
- Make sure family, school or work know the plan and how to use an auto-injector.
- Keep a written allergy action plan and share it with your GP.
- Work with a dietitian if several foods are excluded, to keep the diet balanced.
- Attend reviews so the plan stays up to date and outgrown allergies can be confirmed.
- A food and symptom diary
- Details of all past reactions and any treatment used
- A list of medicines, supplements and other allergies
- Antihistamines stopped for the advised number of days before skin tests
- A parent or carer present for a child's appointment
- A free day booked and instructions followed for any food challenge
⚠ Get urgent help if…
- Difficulty breathing, wheeze, persistent cough or a tight throat
- Swelling of the lips, tongue, throat or face
- Widespread hives or sudden severe itching
- Feeling faint, floppy, dizzy or collapsing
- Repeated vomiting or sudden severe tummy pain after eating
- In a child: pale, floppy, drowsy or struggling to breathe — use adrenaline and call 999
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A clear diagnosis tells you which food causes reactions, what type of allergy it is, and how serious reactions could be, so you can avoid the food and treat reactions confidently. Where an oral food challenge is passed, a food can be reintroduced, or an allergy confirmed as outgrown.
No test is perfect. A positive blood or skin test does not always mean a clinically important allergy, and a negative test does not always exclude one, which is why results are read with the history and sometimes confirmed by challenge. Allergy can also change over time, so the plan needs review.
Many childhood food allergies, such as milk and egg, are outgrown, while others, such as peanut, tree nut and shellfish, more often persist. Because allergy can change, the management plan is reviewed over time, with tests repeated and challenges used to check whether a food can be safely reintroduced. Adult-onset food allergies tend to be longer lasting. Your specialist will advise on a sensible review interval.
Related tests, treatments or support
Food allergy assessment often sits alongside management of related allergic conditions such as eczema, asthma and hay fever, which can affect reaction risk. A dietitian is frequently involved to keep nutrition safe during avoidance. In selected cases, and only in specialist centres, oral immunotherapy (gradual desensitisation) may be discussed as a separate option.
Follow-up & long-term care
You are given a written management and emergency plan and, where needed, adrenaline auto-injectors with training. Reviews, often yearly in children, reassess the allergy, repeat tests if useful and consider challenges. Your GP receives the plan so prescriptions and records are kept up to date.
- Keep adrenaline auto-injectors in date and carry two at all times where advised.
- Refresh how to use auto-injectors and review the action plan regularly.
- Re-check labels, as product ingredients change.
- Attend reviews to reassess the allergy and consider safe reintroduction.
- Keep school, work and carers informed and trained.
Repeat, follow-on and what comes next
- A test or even a challenge can be inconclusive and need repeating.
- Avoidance advice may be revised as tests and challenges clarify which foods matter.
- Childhood allergies may be outgrown, so the diagnosis is reassessed over time.
- A reaction to accidental exposure may prompt a review of the plan and medicines.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clear written management and emergency action plan shared with your GP.
- Adrenaline auto-injectors with training, where there is a risk of anaphylaxis.
- Dietitian support to keep the diet safe and balanced.
- Scheduled reviews to reassess the allergy and consider safe reintroduction.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Length and complexity of the specialist assessment
- Number and type of tests (skin prick, specific IgE blood tests, component testing)
- Whether a supervised oral food challenge is needed, which uses more staff and time
- Dietitian input for avoidance and balanced nutrition
- Prescription and training for adrenaline auto-injectors where needed
- Follow-up reviews and updated written plans
- The specialist's assessment fee
- Which tests are included and the cost of each
- Whether an oral food challenge is included and what monitoring it involves
- Dietitian appointments if needed
- Follow-up reviews and a written allergy action plan
- What happens, and what it costs, if the result is inconclusive or a reaction occurs
- The cancellation policy
On the NHS? Food allergy assessment and management is available on the NHS when clinically indicated; people sometimes choose private care for faster access or a particular specialist.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Reading a positive test as proof of allergy without the supporting history.
- Excluding multiple foods without dietitian input or a plan to reintroduce.
- No written emergency plan or training for adrenaline auto-injectors where needed.
- Relying on unproven tests that drive unnecessary restriction.
Marketing red flags
- Selling IgG, hair analysis or vega 'intolerance' tests as allergy diagnosis.
- Promising to identify dozens of 'food sensitivities' from one sample.
- Recommending broad elimination diets without specialist or dietitian oversight.
- Offering food challenges outside a setting equipped to treat anaphylaxis.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Is this an immediate (IgE) or delayed (non-IgE) allergy, and which tests fit?
- How serious could a reaction be, and do I need adrenaline auto-injectors?
- Which foods do I genuinely need to avoid, and which are safe?
- Should I see a dietitian to keep my (or my child's) diet balanced?
- Could this be outgrown, and when should we reassess or consider a challenge?
- What is my written emergency plan if a reaction happens?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my treatment, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this treatment not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
What is the difference between food allergy and intolerance?
Do home or high-street allergy and intolerance tests work?
Is an oral food challenge dangerous?
Will my child grow out of their allergy?
Do I need an adrenaline auto-injector?
Can I be assessed on the NHS?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NICE CG116 — food allergy in under 19s: assessment and diagnosis Allergy UK — allergy testing NHS — food allergy BSACI guidelines and standards NICE QS118 — food allergy quality standard
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
Related guides: Oral immunotherapy (desensitisation) for food allergy · Drug allergy testing and challenge · Hay fever (allergic rhinitis) management · Allergy injections (subcutaneous immunotherapy) · Anaphylaxis assessment and adrenaline pen training