A diagnosis of food allergy in a toddler is one of the more disorienting moments a parent can experience. Suddenly the kitchen is a minefield, the playdate is an interrogation, and the school lunchbox is a daily exercise in vigilance. The good news: most paediatric food allergies are very manageable with the right framework — and a meaningful percentage are eventually outgrown.

What allergy testing does tell you

There are two well-validated allergy tests in clinical use:

  • Skin prick test (SPT) — a tiny amount of allergen extract is placed on the skin and pricked. A wheal (small raised bump) within 15 minutes indicates sensitisation.
  • Specific IgE blood test (sIgE / RAST) — measures the level of IgE antibodies your child's immune system has produced against a specific food.

Both tests measure sensitisation — meaning the immune system has produced an IgE response. They do not definitively prove clinical allergy on their own. A child can be sensitised (test positive) without being allergic in real life. This distinction matters because it dictates whether you should be eliminating or reintroducing.

What allergy testing doesn't tell you

A positive test plus no symptoms after eating the food usually means the food is safe to keep eating — not that it should now be avoided.

Three things to know:

  • A positive test alone doesn't mean clinical allergy. Sensitisation rates are far higher than true allergy rates.
  • The size of the wheal or the IgE number correlates loosely with severity, but not perfectly. A small wheal is not a guarantee of mild reaction.
  • Tests cannot predict what will happen the next time. They can guide probability, not certainty.

This is why the gold standard for diagnosing food allergy is still clinical history — what was eaten, what symptoms followed, how soon — combined with testing. Not testing alone. The patients I see who've been put on a 12-food elimination diet based on an "IgG food sensitivity panel" almost always need that diet undone.

A note on IgG testing IgG and "food sensitivity" panels (often sold direct-to-consumer) are not validated tests for food allergy. They measure exposure, not allergy. Major allergy organisations including FARE and the EAACI explicitly recommend against their use for diagnosing food allergy.

Living with the diagnosis

Once your child has a confirmed food allergy, the practical work begins. Three layers:

Layer 1: Avoidance

Read every label, every time. Manufacturers change recipes. "May contain" labelling on packaged food in South Africa is voluntary — interpret conservatively, especially for severe allergies. Build a roster of confidently safe brands and revisit it every six months.

Layer 2: Substitution

The goal isn't a restricted diet — it's a normal-feeling diet built around safe alternatives. A child with cow's milk allergy can absolutely have rich, varied meals using fortified plant milks, calcium-rich greens, well-prepared tofu and other protein sources. We design these substitution maps so your kitchen runs the same as everyone else's.

Layer 3: Emergency response

Every child with anaphylaxis risk needs an adrenaline auto-injector (EpiPen, Anapen) carried in two places at all times — usually a parent's bag and a daycare/school bag. Every caregiver — daycare, grandparents, babysitters — needs hands-on training in how to use it. We coordinate this with your paediatrician or allergist.

The daycare and school conversation

Daycares aren't trying to harm your child — they're working with limited training and a very full day. Help them help you.

What works in practice:

  • A one-page allergy action plan with a recent photo, the diagnosed allergens, the symptoms to watch for, and the emergency response. We write these as part of a paediatric allergy consultation.
  • Hands-on training with the auto-injector device — not just a verbal handover
  • A safe-snack box stored at the daycare, restocked monthly, so your child is never left out at birthday parties or surprise treats
  • An opt-in allergy table at school for nut-free children — the goal is inclusion, not isolation

When can we reintroduce?

Many childhood food allergies — particularly milk, egg, wheat, and soy — are outgrown over time. Up to 80% of cow's milk allergic children outgrow it by age 5. Egg allergy resolves in a similar pattern. Peanut, tree nut and shellfish allergies are more likely to persist.

Reintroduction should always be done under medical supervision, usually starting with an "oral food challenge" in a clinical setting. The signals we look for before considering a challenge:

  • The child has had no reactions for 12+ months
  • SPT or sIgE values are trending downward
  • The child can tolerate "baked" forms of the allergen (for milk and egg, this is often a positive sign)
  • Your allergist agrees the timing is appropriate

An oral food challenge under the right conditions is one of the most rewarding moments in paediatric allergy work. The diagnosis ends. The lunchbox lightens. The child gets their world back.

Working with us Allergy patients are seen at the Craighall Park rooms in person, or virtually for follow-ups and reviews. Paediatric initial consultations run 75 minutes. We coordinate closely with your paediatrician and allergist; a consultation often includes a written daycare or school plan as part of the package.