Paediatric Allergy Assessments: What Parents Need to Know

The consequences of this rise are visible in hospital admission data. A report from the Anaphylaxis Campaign found that the number of children admitted to hospital with anaphylaxis rose by 72% between 1998 and 2012 [5]. Triggers include not only foods but also insect venom, latex and medications – a breadth of potential causes that underscores the importance of specialist evaluation rather than assumption.

Understanding why allergies are rising remains an active area of research. Leading theories include the hygiene hypothesis – the idea that reduced early microbial exposure may impair immune tolerance – alongside changes in diet, increased environmental pollutant exposure, and altered patterns of allergen introduction in infancy [6][7]. While the causes continue to be studied, what is clear is that the need for timely, accurate diagnosis has never been greater.

Signs Your Child May Need an Allergy Assessment

Not every rash or bout of sneezing points to an allergy, but certain patterns of symptoms are clinically significant and should prompt a professional evaluation. Recurring skin reactions are often the first thing parents notice. Hives (urticaria), swelling, persistent eczema or contact rashes are among the most common presentations of allergic disease in children [8]. Atopic eczema, which affects approximately one in five children in the UK, is also frequently associated with underlying food or environmental sensitisation that a formal assessment can identify and address [9].

In some children, the gut is the primary site of response. Digestive symptoms after eating – such as vomiting, abdominal pain, bloating, or diarrhoea – particularly when they follow a recognisable pattern linked to specific foods, may suggest food allergy [10]. For other children, it can be the airways and upper respiratory system that are most affected. Symptoms such as persistent wheezing, coughing, nasal congestion and itchy or watery eyes can all reflect allergic sensitisation to environmental triggers such as pollen, dust mites, pet dander or mould [11].

Allergic rhinitis – sometimes dismissed as a ‘permanent cold’ – affects around 10–15% of children in the UK and is strongly associated with the later development of asthma [11][12].

When to Act on Symptoms and Get Specialist Help 

Many families seekan allergy assessment not following a single dramatic event, but after a prolonged period of unexplained, recuring or inconsistent symptoms.  In the most serious cases, across any of these trigger categories, anaphylaxis or severe reactions represent an absolute indication for specialist assessment. 

Any episode characterised by the sudden onset of breathing difficulty, widespread hives, swelling of the throat or tongue, a drop in blood pressure or collapse constitutes a medical emergency [13]. Triggers may include foods, insect stings, latex or medications. Any child who has experienced anaphylaxis should have a formal allergy assessment to help identify the likely trigger, confirm the diagnosis, and guide ongoing management. This should include a written emergency action plan, and training for parents, carers and school staff in the use of adrenaline auto-injectors where indicated

Reactions to medications or insect stings also warrant specialist review. Antibiotic allergy, particularly penicillin allergy, is commonly reported in children, although true IgE-mediated drug allergy is less common than parental reporting often suggests [13]. Similarly, reactions following insect stings — ranging from large local swellings to hives or more generalised symptoms — should be assessed carefully to understand the risk of future severe reactions and whether venom immunotherapy may be appropriate.

Similarly, reactions following insect stings, including localised swelling, hives or systemic symptoms, warrant specialist evaluation to assess the risk of future anaphylaxis and the potential role of venom immunotherapy.  Research has shown that parental reporting of suspected food allergy often overestimates confirmed allergy rates. This is one reason why formal assessment is so important: it helps identify true allergies, while also safely ruling out those that are not present, reducing unnecessary dietary restrictions, anxiety and disruption to family life [13].

Understanding the Types of Allergic Reactions

While symptoms can be frightening, it is important for parents to understand that not all allergic reactions work in the same way, and this distinction shapes how assessment and testing are approached. IgE-mediated allergies are the classic, immediate-type reactions driven by immunoglobulin E antibodies. They typically occur within minutes to two hours of exposure and can range from mild symptoms such as hives or sneezing to life-threatening anaphylaxis. [14]

These are the reactions most reliably detected by standard allergy tests such as skin prick testing and specific IgE blood tests, and can be triggered by foods, airborne allergens, insect venom, latex and medications alike. Non-IgE-mediated allergies involve different immune mechanisms and tend to produce delayed reactions – often hours or days after exposure – primarily affecting the gut and skin [15].

These are more difficult to detect via standard allergy tests and are often diagnosed through structured elimination diets and food challenges. Conditions such as FPIES and allergic proctocolitis in infants fall into this category.

What a Paediatric Allergy Assessment Involves

A comprehensive paediatric allergy assessment is a structured, multi-component process tailored to the child’s age, symptom history and clinical picture. It begins with a detailed clinical history – the most important part of any allergy assessment [16]. This history guides the selection of appropriate tests and prevents unnecessary or indiscriminate testing.

A specialist will ask about: 

• The timing, nature and severity of reactions
• Suspected triggers, whether dietary, environmental, chemical or insect-related
• The child’s medical and feeding history
• Family history of allergic disease
• And any treatments already tried

Among these possible follow-ups is prick testing (SPT), which involves applying small amounts of allergen extracts to the forearm and measuring any wheal response after 15 minutes. It is well-tolerated by most children, provides rapid results and has high sensitivity for IgE-mediated allergies [17]. There are also specific IgE blood tests, which measure allergen-specific antibodies in the blood and are particularly useful where skin conditions make SPT difficult, or where very young infants are being assessed [18].

Additional assessments – including patch testing for contact dermatitis or ALEX² and ISAC molecular testing – may be incorporated depending on clinical need [19].

Why Early Assessment Matters

Children with unidentified allergies may experience repeated exposures that carry risk of serious reactions. Those with unmanaged allergic rhinitis may develop sleep disruption, reduced concentration and lower academic performance [20]. Families living with undiagnosed food allergy often restrict diets unnecessarily and broadly, raising the risk of nutritional deficiencies – vitamin D and calcium deficiency are of particular concern in children avoiding dairy [21].

Early, accurate assessment enables avoidance strategies to be targeted and proportionate, emergency management plans to be put in place where needed, and in many cases, active intervention through allergen immunotherapy – a treatment with strong evidence for modifying the allergic response in conditions such as allergic rhinitis, asthma and venom allergy [22]. Research also supports the value of early dietary intervention for food allergy, specifically with trials demonstrating that early introduction of peanut in high-risk infants can reduce the rate of peanut allergy development – a finding that has since transformed clinical guidance on infant feeding [23].