Preparation for an IgE allergy test depends on the test type. For total IgE (like your 250 IU/mL result), the provided knowledge indicates no special preparation is needed – it's a standard blood draw, usually without fasting. However, elevated total IgE only suggests an allergic tendency, not a specific allergy; parasites, smoking, or immune conditions can also raise it. For specific IgE tests (against individual allergens), doctors often advise stopping antihistamines 3–7 days beforehand to avoid false negatives, but this is not mentioned in the given context. Therefore, evidence for preparation is limited: the sources provided do not include specific instructions. The safest approach is to follow your physician's or lab's guidance. For children or suspected food allergies, testing should always be medically supervised. Caveat: high total IgE alone does not confirm an allergy – specific IgE testing is required.
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