Allergy test

Allergy test

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Credit: PAUL RAPSON/SCIENCE PHOTO LIBRARY

Caption: Allergy test. Reaction to a skin scratch allergy test being measured on a 10-year-old boy's arm. This test is used to identify substances (allergens) that cause an allergic reaction in the patient. Weak solutions of various suspected allergens and controls were dropped on to the boy's skin, which was then scratched to introduce the allergens under the skin. Letters on the skin show the location of each allergen. If an area of skin becomes swollen or red the patient is allergic to the substance at that location. The size of the reaction, measured using a plastic template (centre), gives an indication of the severity of the allergy.

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Keywords: 10, allergen, allergens, allergic, allergy, arm, boy, caucasian, child, diagnosis, diagnostic, equipment, hospital, human, hypersensitive, hypersensitivity, male, measuring, measurment, medical, medicine, patient, plastic, reaction, reaction gauge, results, severity, skin, skin scratch test, template, ten, test, testing

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