What should you know about tests to find out allergies?

A positive result shows sensitisation to a substance tested, such as pollen, dust mites, a pet allergen, or a food. It does not by itself prove that substance causes your symptoms. A negative result makes some allergies less likely, but it may not cover every possible trigger. Testing is most useful when it matches a clear pattern, such as symptoms after a particular exposure.

Before testing, tell the clinician about antihistamines, asthma, eczema, previous severe reactions, and the timing of symptoms. Do not stop prescribed medicine unless the clinician gives you instructions. Keep a brief record of exposures, symptoms, and meals when relevant. Management may involve avoiding a confirmed trigger, treating symptoms, or arranging further assessment. Related conditions include Allergic Rhinitis, Food Allergy, and Pet Allergy.

Seek emergency help for sudden trouble breathing, throat or tongue swelling, faintness, or widespread symptoms after an exposure. These can be signs of Anaphylaxis. A clinician should also review recurring wheeze, persistent nasal symptoms, or eye irritation because allergic conditions can overlap with Asthma or Allergic Conjunctivitis.

Which trigger is being investigated, and why? Which medicines need special instructions before testing? How should this result change my daily precautions? Could another condition explain the symptoms if the test is negative?