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We've helped over 200,000 people take control of their health. This test detects IgE antibodies which are often raised in response to allergic reactions. It can sometimes help confirm an allergy when symptoms are present.
Allergy blood tests often produce false-positive results, indicating an allergy that may not actually exist. Therefore, we recommend keeping a diary of possible allergens you’ve been exposed to in the hours prior to the onset of symptoms. Sharing this with our doctors allows us to give you the most reliable interpretation.
Immunoglobulin E
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Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed. Medications that affect the immune system may reduce IgE levels. These include antihistamines, corticosteroids, and immunosuppressants. Don’t stop these medications without first consulting your doctor.
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Allergy blood tests frequently give false-positive results, indicating an allergy when there isn’t one. IgE blood tests don’t indicate the severity of an allergy, though the higher your result, the more likely you are to react to an allergen. This test can’t pinpoint specific allergens – it’s important to keep a diary of potential allergens you’ve been exposed to before your symptoms came on.
False-negative results are also possible, where the test indicates no allergy despite there being one. This is less common than a false-positive result but can still occur. This is usually due to test timing (for example, taking the test a long time after allergy symptoms have settled), the type of allergy (delayed hypersensitivity reactions and non-IgE-mediated allergies like food intolerances are often not picked up by this test), or if baseline IgE levels are very low to start with.
