Allergy diagnosis can be done through skin testing or a blood test. The skin test is done by exposing your skin to different substances by way of scratching or pricking the skin. Many different allergens can be tested at the same time by exposing different areas of skin. If the skin reacts with a rash or swelling, this is considered a positive reaction. This is a time-consuming test, but very accurate and relatively painless.

An allergen-specific IgE antibody test is a blood test that measures the amount of immunoglobulin E (IgE) in your blood for a specific substance. If your body has developed an allergy toward a certain substance, the amount of IgE for that substance will be high.

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