Health condition
Egg and nut allergy testing
Egg and nut allergies are the most common serious food allergies of childhood; proper testing tells you which specific foods are a risk for your child, which are safe, and whether the allergy is being outgrown.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Testing combines skin prick tests and specific IgE blood tests, always interpreted against the reaction history
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Component testing can help distinguish likely serious peanut allergy from milder cross-reactions
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A supervised hospital food challenge is the definitive test when results are unclear or outgrowth is suspected
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Specialist: a consultant paediatric allergist; many egg allergies are outgrown, and baked egg is often tolerated first
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
After a reaction to egg or nuts, most parents' instinct is to avoid everything and hope for the best, but blanket avoidance has real costs - nutritional, social and psychological - and untested assumptions cut both ways: some children avoid foods they could safely eat, while others are unknowingly at risk. Structured testing answers the practical questions: which nuts, how severe, is baked egg tolerable, and is this allergy fading with age.
Diagnosis and treatment routes
A paediatric allergist takes the reaction history, then uses skin prick testing and specific IgE - including component tests that separate high-risk peanut proteins from pollen cross-reactivity - to build an individual risk picture for each food. Where the picture is uncertain, a day-case oral food challenge under medical supervision gives a definitive answer, and testing is repeated over the years because egg allergy in particular is commonly outgrown. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant paediatric allergist. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Egg and nut allergy testing.
Quick, plain-English answers to what people ask us most.
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Can you explain what egg and nut allergy testing is?
Egg and nut allergy testing refers to a recognised clinical condition that a GP or specialist assesses using your history, examination and, if appropriate, targeted investigations. The way it presents and its impact can vary considerably from person to person.
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What causes egg and nut allergy testing?
The exact cause of egg and nut allergy testing can involve a mix of genetic, environmental and lifestyle factors, and it isn't always possible to pin down a single trigger. A specialist assessment can help identify any modifiable risk factors relevant to you.
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What does egg and nut allergy testing look like?
Symptoms of egg and nut allergy testing vary from person to person and can range from mild and easily missed to significant enough to affect daily life. Because overlapping conditions can produce similar symptoms, a clinical assessment is the most reliable way to confirm what's actually going on.
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Is egg and nut allergy testing serious or dangerous?
Most cases of egg and nut allergy testing are manageable with appropriate care, though, like many conditions, it can occasionally lead to complications if left unassessed or untreated. Your clinician can give you a realistic sense of the risks based on your specific presentation.
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Does egg and nut allergy testing run in families?
In most cases egg and nut allergy testing isn't straightforwardly inherited, though family history can sometimes be a relevant background factor. A clinician can help you understand whether it's worth mentioning relatives' health when being assessed.
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Can egg and nut allergy testing be treated or prevented?
Egg and nut allergy testing can often be managed effectively, and in some cases prevented or reversed, with the right combination of lifestyle changes, medication or other targeted treatment. A specialist will tailor the approach to your circumstances rather than applying a one-size-fits-all plan.
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What treatment options are available for egg and nut allergy testing?
Management of egg and nut allergy testing is individualised, ranging from conservative measures and monitoring through to more active medical or surgical treatment depending on how it's affecting you. A clear diagnosis is the first step towards choosing the right approach.
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How long does egg and nut allergy testing last?
The outlook for egg and nut allergy testing varies widely depending on the underlying cause, how early it's diagnosed, and how it responds to treatment. Many people see significant improvement with appropriate care, and your specialist can give you a more personalised timeframe once they've reviewed your case.
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What else could egg and nut allergy testing be mistaken for?
Because several conditions can share similar symptoms to egg and nut allergy testing, clinicians often consider a short list of possibilities before confirming a diagnosis. This is one of the main reasons a proper assessment, and sometimes targeted tests, matters more than relying on symptoms alone.
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When should I see a doctor about egg and nut allergy testing, and how quickly can I be seen privately?
It's worth seeking medical advice if symptoms of egg and nut allergy testing are persistent, worsening, or affecting your daily life, rather than waiting for them to resolve on their own. NHS routine referrals for this kind of assessment can take anywhere from around 20 to 45+ weeks, whereas private consultants typically offer an appointment within about two weeks.