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In the prick, scratch and scrape tests, a few drops of the purified allergen are gently pricked on to the skin surface, usually the forearm. This test is usually done in order to identify allergies to pet dander , dust, pollen , foods or dust mites .
Allergy blood tests measure the presence of IgE antibodies to specific foods, pollens, mites, animals, insects and other environmental factors. (IgE, short for "immunoglobulin E", is the antibody that triggers food allergy symptoms.)
Diagnosis is usually based on a medical history, elimination diet, skin prick test, blood tests for food-specific IgE antibodies, or oral food challenge. For skin-prick tests, a tiny board with protruding needles is used. The allergens are placed either on the board or directly on the skin.
Food intolerance is a detrimental reaction, often delayed, to a food, beverage, food additive, or compound found in foods that produces symptoms in one or more body organs and systems, but generally refers to reactions other than food allergy. Food hypersensitivity is used to refer broadly to both food intolerances and food allergies.
Diagnosis of fish allergy is based on the person's history of allergic reactions, skin prick test and measurement of fish-specific serum immunoglobulin E (IgE or sIgE). Confirmation is by double-blind, placebo-controlled food challenges. Self-reported fish allergy often fails to be confirmed by food challenge. Prevention
Before a diagnosis can be made, it is best to keep a food diary. This is important as the physician can then perform an allergy test. A comprehensive history is obtained so that random testing is avoided. The diagnosis of OAS may involve skin prick tests, blood tests, patch tests or oral challenges. [citation needed] Exams
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