Allergy testing and management (Allergy assessment, testing and management in children)
Assessing, testing for and managing allergies in children — using a careful history plus reliable tests (skin prick or blood IgE) to guide diagnosis and a clear management plan.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A careful history is the most important part — reliable tests (skin prick or specific IgE blood test) support it, they do not replace it.
- A positive test does not by itself prove an allergy; a child can be sensitised without reacting, so results must be interpreted by an allergy expert.
- Unproven tests (IgG blood tests, hair analysis, kinesiology, VEGA) are not reliable and can cause unnecessary, sometimes harmful, food restrictions — avoid them.
- If a child has had, or is at risk of, a severe reaction (anaphylaxis), the plan should include adrenaline auto-injectors and a clear action plan; a severe reaction is a 999 emergency.
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.
A clearer, more accurate diagnosis that avoids both missed allergies and unnecessary food avoidance
Testing is not useful without a clear history — random panels of tests in a child with no relevant symptoms cause confusion and needless avoidance.
Skin prick bumps and itching settle within an hour or so. After a blood test there is nothing to recover from. Any reaction during testing is treated on...
A clear written plan explaining the diagnosis, avoidance and treatment in plain English.
Skin prick bumps and itching settle within an hour or so. After a blood test there is nothing to recover from. Any...
Blood (IgE) results come back. The clinician interprets all results with the history and confirms the plan.
Management starts: avoidance advice, antihistamines or nasal sprays, an action plan, and adrenaline auto-injectors...
Some childhood allergies (such as milk and egg) are outgrown, so the plan is reviewed. Immunotherapy or supervised...
What is allergy testing and management in children?
An allergy is when the immune system reacts to something harmless — such as a food, pollen, house dust mite, pet or insect sting — as if it were a threat. Allergy testing and management in children is about working out whether a true allergy exists, what to it, and how to keep your child safe and well.
The most important part is a careful allergy-focused history: what happened, how quickly, how often, and with what exposure. Reliable tests then support the diagnosis. The two trustworthy tests are the skin prick test (a tiny prick through a drop of allergen on the skin) and a specific IgE blood test. Sometimes a supervised oral food challenge is used as the most definitive test.
A key point parents often find surprising is that a positive test alone does not prove an allergy. A child can test 'positive' (be sensitised) without reacting in real life, and tests can also be negative when there is a real problem. Results must always be interpreted by someone with allergy expertise alongside the story of what actually happens.
Management depends on the allergy. It may include avoiding the trigger, antihistamines or nasal sprays for hay fever, a clear written action plan, and, for those at risk of severe reactions, adrenaline auto-injectors. Some children are offered immunotherapy or supervised reintroduction under specialist care. Be cautious of unproven tests (such as IgG blood tests, hair analysis, kinesiology or VEGA testing) — these are not reliable and can lead to unnecessary, even harmful, diet restrictions.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Skin prick test vs specific IgE blood test
| Feature | Skin prick test | Specific IgE blood test |
|---|---|---|
| How | Tiny prick on the skin | Blood sample |
| Speed of result | About 15–20 minutes | Usually a few days |
| Best when | Quick answer; many allergens at once | Severe eczema, can't stop antihistamines, needle-tolerant |
| Limitation | Antihistamines must be stopped first | Sensitisation, not proof of allergy |
| Safety | Done where anaphylaxis can be treated | Low risk (blood test only) |
Neither test alone diagnoses allergy. Both are interpreted alongside the history of what actually happens to your child.
Preparing for your treatment
- Keep a clear diary of reactions: what happened, how soon after exposure, how long it lasted and what helped.
- Note suspected triggers, family history of allergy, and any eczema, asthma or hay fever.
- Ask whether antihistamines need to be stopped before a skin prick test (they can block the result) and for how long.
- Bring photos of any rashes or reactions and a list of all foods or products involved.
- Do not start cutting out major foods before the appointment without advice, as this can affect testing and nutrition.
- Bring any current medicines, including any adrenaline auto-injectors your child already has.
- Bring previous test results and clinic letters if you have them.
What happens
The clinician starts with a detailed allergy-focused history, which is often the most useful part. Based on that, they decide whether testing will help and which test is most suitable.
For a skin prick test, small drops of allergen solutions are placed on the forearm and a tiny prick is made through each. After about 15–20 minutes the skin is checked for small raised bumps. It is mildly itchy but quick, and is done in a setting where a severe reaction could be treated. A specific IgE blood test simply needs a blood sample, with results in a few days.
The results are then read alongside the history, because a test result on its own does not confirm or exclude an allergy. Where the picture is unclear, a supervised oral food challenge may be arranged under close medical supervision.
You should leave with a clear explanation of what was found, a management plan, and — if your child is at risk of a severe reaction — an action plan and adrenaline auto-injectors with training in how to use them.
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…
- Testing is not useful without a clear history — random panels of tests in a child with no relevant symptoms cause confusion and needless avoidance.
- Skin prick testing may not be suitable if antihistamines cannot be stopped or the skin is severely affected by eczema; a blood IgE test may be used instead.
- Unproven tests (IgG, hair analysis, kinesiology, VEGA) are never an appropriate way to diagnose allergy.
- Allergy testing is the wrong route for symptoms that are not allergic in nature (for example most non-IgE gut symptoms), which need a different assessment.
Delay or rearrange if…
- Antihistamines have been taken recently and a skin prick test is planned (they can block the result).
- Your child is acutely unwell or has uncontrolled eczema over the test area.
- A reaction is being actively managed — stabilise first, then assess.
- Major foods have just been cut out without advice, which can affect both testing and nutrition.
Alternatives to discuss
- A careful clinical history and trial of avoidance and planned reintroduction under guidance
- A specific IgE blood test when skin prick testing is not suitable
- A supervised oral food challenge for a definitive answer
- Symptom management (antihistamines, nasal sprays) for hay fever without extensive testing
- Specialist referral for complex, severe or uncertain allergy
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
- A clearer, more accurate diagnosis that avoids both missed allergies and unnecessary food avoidance
- A management plan tailored to your child, including what to avoid and what to do in a reaction
- Reassurance where an allergy is ruled out, so foods are not cut out needlessly
- Identification of children at risk of severe reactions so they can carry adrenaline auto-injectors
- Better control of hay fever or allergic symptoms, helping sleep, school and play
- Access to options such as immunotherapy or supervised reintroduction where appropriate
Risks & complications
- Mild, brief itching or a small raised bump from skin prick testing
- Discomfort from a blood test
- Results that show sensitisation without a true allergy (false positives), causing confusion if not interpreted well
- Anxiety while waiting for results or a plan
- A negative test despite a real problem (false negative), so symptoms must still be taken seriously
- Needing further or repeat testing, or a supervised food challenge, to be sure
- Unnecessary dietary restriction if tests are over-interpreted
- A more significant allergic reaction during skin prick testing or an oral food challenge — these are done where it can be treated immediately
- Nutritional problems in a child from prolonged, unnecessary food avoidance based on unreliable testing
The biggest pitfalls are misinterpreting tests and relying on unproven ones. A positive skin prick or blood test shows sensitisation, not necessarily a clinical allergy, and can lead to children needlessly avoiding foods if read without the history. Unproven tests (IgG, hair, kinesiology, VEGA) can cause real harm through unnecessary restriction. Ask how the result fits your child's actual symptoms, and whether avoiding a food is genuinely needed. If your child is at risk of a severe reaction, make sure they have a plan and adrenaline auto-injectors; a severe reaction is a 999 emergency.
Published figures to discuss
Allergy tests have important accuracy limits rather than fixed 'complication rates'. Both skin prick and specific IgE tests can be positive in children who are sensitised but not clinically allergic (false positives), and can occasionally be negative despite a real allergy (false negatives). The exact predictive value varies a great deal with the allergen, the test cut-off used and the child's history, so single percentages would be misleading and are not quoted here.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| False-positive allergy test | Common interpretive issue | A positive skin prick or specific IgE result shows sensitisation, not necessarily a clinically important allergy. | Guide sourcesClinical context |
| False-negative allergy test | Recognised | Timing, antihistamines, the wrong allergen and non-IgE allergy can make tests misleading. | Guide sourcesClinical context |
| Systemic reaction during skin testing or challenge | Rare, but important | Higher-risk testing and food challenges should be done in appropriately equipped settings with trained staff. | NICE CG116 — Food allergy in under 19s: assessment and diagnosisnice.org.ukSource-linked context |
| Nutritional harm from unnecessary avoidance | Common practical risk | Children should not be placed on broad exclusion diets without a clear diagnosis and dietetic support where needed. | NICE CG116 — Food allergy in under 19s: assessment and diagnosisnice.org.ukSource-linked 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
There is no physical recovery from allergy testing. 'Afterwards' is about understanding the results, starting the right management, and knowing what to do in a reaction.
- Mild itching and small bumps after skin prick testing that settle within an hour
- Taking time to understand which results are meaningful for your child
- Adjusting daily routines to avoid a confirmed trigger
- Learning and practising how to use an adrenaline auto-injector if prescribed
Aftercare
- Follow the agreed plan for avoidance, medicines or nasal sprays.
- Keep any adrenaline auto-injectors in date, carry two, and make sure carers know how to use them.
- Share the allergy action plan with nursery or school and anyone who looks after your child.
- Re-introduce foods only as advised — do not test risky foods at home without guidance.
- Keep a note of any further reactions, including what was eaten and the symptoms and timing.
- Attend reviews, as some allergies are outgrown and plans change.
- Avoid unproven 'allergy tests' and diets that cut out major foods without expert advice.
- Reaction diary completed before the appointment
- List of suspected foods/triggers and family history
- Advice on stopping antihistamines before skin prick testing (if relevant)
- Any current adrenaline auto-injectors brought along
- Previous results and clinic letters
- Allergy action plan to share with school/carers
- Plan for who carries and can use the auto-injectors
⚠ Get urgent help if…
- Difficulty or noisy breathing, wheeze, a hoarse voice, or the throat feeling tight — use an adrenaline auto-injector if prescribed and call 999
- Swelling of the lips, tongue, mouth or throat — use the auto-injector if prescribed and call 999
- Sudden floppiness, drowsiness, going pale or blue-grey, or collapse — call 999
- Widespread hives with any breathing or tummy symptoms after a known or suspected allergen — treat as anaphylaxis and call 999
- A non-blanching rash, a child who will not wake, or a seizure — call 999
- Repeated vomiting and distress shortly after a food in a child with known allergy — seek urgent advice
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 good result is an accurate diagnosis and a clear, workable plan: knowing what (if anything) your child is genuinely allergic to, how to avoid it, how to treat symptoms, and what to do in an emergency. Sometimes the best result is ruling an allergy out so a food is not avoided needlessly.
Tests cannot, on their own, prove an allergy or predict exactly how severe a future reaction will be. They show sensitisation and risk, which must be read with the history. Be wary of any service offering a long list of 'allergies' from a single unproven test, or promising to cure allergies quickly.
Many childhood allergies change over time. Allergies to milk and egg are often outgrown, while peanut, tree nut and shellfish allergies are more likely to persist. Because of this, allergy plans and the need for adrenaline auto-injectors should be reviewed periodically, and any reintroduction should be guided by a clinician rather than tried at home.
Related tests, treatments or support
Allergy assessment often goes hand in hand with managing eczema, asthma and hay fever, which frequently occur together. Where a child is at risk of anaphylaxis, allergy management overlaps with food allergy and anaphylaxis advice, including adrenaline auto-injectors and an action plan.
Follow-up & long-term care
Follow-up depends on the diagnosis. It may be a review to update the plan, repeat testing to see if an allergy has been outgrown, or specialist input for immunotherapy or supervised food challenges. You should know who to contact, how to renew auto-injectors and prescriptions, and when your child should be reviewed again.
- Keep adrenaline auto-injectors in date and replace before they expire
- Refresh how to use the auto-injector and review the action plan regularly
- Update nursery, school and carers when the plan changes
- Attend reviews to check whether an allergy has been outgrown
- Keep any antihistamines or nasal sprays stocked for seasonal symptoms
Repeat, follow-on and what comes next
- Repeat testing is common as children may outgrow some allergies, especially milk and egg.
- An uncertain result often leads to a supervised food challenge rather than a firm label.
- Plans and the need for auto-injectors are reviewed and updated over time.
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 plan explaining the diagnosis, avoidance and treatment in plain English.
- Where needed, two in-date adrenaline auto-injectors and training, plus a school/carer action plan.
- A named contact and a route for questions and prescription renewals.
- Planned review to reassess whether an allergy persists or has been outgrown.
- Safeguarding-aware advice on emergency signs and exactly when to call 999.
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:
- Whether assessment is with a GP or a specialist allergy clinic
- The number and type of tests (skin prick, specific IgE blood tests, component testing)
- Whether a supervised oral food challenge is needed (these require close supervision)
- Length and number of appointments and any reports
- Adrenaline auto-injectors, antihistamines or other medicines
- Immunotherapy, if recommended, which involves a long course
- Follow-up reviews and repeat testing over time
- Who carries out and interprets the tests and their allergy expertise
- Which specific tests are included and the cost of each
- Whether a written action plan and auto-injector training are included
- Cost of any supervised food challenge or further testing
- What happens if results are inconclusive
- How prescriptions and follow-up reviews are handled and charged
- Cancellation policy and how care links with your NHS GP
On the NHS? Allergy assessment and testing are available on the NHS when clinically needed; some families use private clinics for speed, but reliable testing should always be interpreted alongside the clinical history by suitably qualified clinicians.
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
- Treating a positive test as proof of allergy without explaining sensitisation.
- Advising a child to avoid foods based on unproven tests.
- No clear written action plan or, where needed, no adrenaline auto-injector training.
- Not explaining what a normal, abnormal or inconclusive result actually means for your child.
- Long lists of 'allergies' generated by a single panel without clinical correlation.
Marketing red flags
- 'Comprehensive' allergy or intolerance panels (often IgG) sold direct to the public.
- Hair analysis, kinesiology or VEGA testing offered as allergy tests.
- Promises to 'cure' allergies quickly or with supplements.
- Encouraging broad food elimination without nutritional or clinical oversight.
- Diagnosing food 'intolerances' with tests that have no scientific basis.
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.
- Based on my child's history, which test (if any) is most useful, and why?
- How do you interpret this result alongside what actually happens to my child?
- Does this result mean my child must avoid the food, or could they still tolerate it?
- Is my child at risk of a severe reaction, and do they need adrenaline auto-injectors?
- Could a supervised food challenge give a clearer answer?
- Might my child outgrow this, and when should they be retested or reviewed?
- What management do you recommend for hay fever or other allergic symptoms?
- 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
Does a positive allergy test mean my child is definitely allergic?
Are home or high-street 'allergy tests' reliable?
Can I get allergy testing on the NHS?
Do I need to stop antihistamines before a skin prick test?
Will my child grow out of their allergy?
What if my child is at risk of a severe reaction?
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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 Allergy UK — Food allergy testing and diagnosing (unproven tests) NHS — Allergies (diagnosis and management) BSACI — Standards and resources for allergy care
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.
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