How effective is allergy testing for food allergy?

A skin-prick test or blood test may show that your immune system recognises a food. This is called sensitisation and does not, on its own, prove that eating the food causes symptoms. A negative result can make an immediate allergy less likely, although it may not explain every type of food reaction.

The clinician considers the food, the amount eaten, the timing of symptoms and whether the same pattern has happened before. Testing a wide range of foods without a matching history can create confusing positives and unnecessary avoidance.

Record the food involved, preparation, portion, time to symptoms and symptoms such as hives, swelling, vomiting, cough or wheeze. Take this record and your medicines list to an allergy appointment.

Do not deliberately eat a suspected trigger at home to check a result. If uncertainty remains, a specialist may discuss a supervised oral food challenge, with precautions in place. Keep eating tolerated foods unless a clinician advises otherwise, so your diet stays as varied as possible.

Seek emergency help for trouble breathing, throat or tongue swelling, faintness, collapse, or symptoms affecting more than one body system after eating. Use your prescribed adrenaline auto-injector promptly if your allergy action plan tells you to, then seek emergency care.

Which test fits my reaction pattern, and what would a positive or negative result change? Could another condition explain these symptoms? Should I have an allergy action plan or supervised food challenge?