What should you know about an IgE allergy test?

Immunoglobulin E, or IgE, is an antibody involved in immediate allergic reactions. A positive result shows sensitisation to an allergen; it does not by itself prove that eating, touching or breathing that substance causes your symptoms. A negative result makes an IgE-mediated allergy less likely, but your clinician may consider other explanations. Testing is usually chosen for suspected triggers such as foods, dust mites or pets, based on a detailed reaction history.

Before testing, list the suspected trigger, the amount or exposure, how quickly symptoms began, and what happened afterwards. Ask whether medicines need adjustment before skin testing. Do not deliberately reintroduce a food that has caused a serious reaction unless a qualified clinician plans and supervises it. Depending on the pattern, your clinician may discuss Food Allergy, Allergic Rhinitis, or Pet Allergy.

Seek emergency help immediately for trouble breathing, throat or tongue swelling, faintness, severe wheezing, or rapidly spreading symptoms after an exposure. These can be signs of Anaphylaxis. A milder rash or itching still deserves medical advice when it keeps returning, affects eating or sleep, or follows a specific food or medicine.

Which allergens fit my reaction history? Do I need a blood test, skin test, or another assessment? Could medicines affect the result? What should I do if I am exposed before the result is available?