How can allergies be detected in a patient?

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(B) Allergies are exaggerated immune responses to certain antigens present in the environment. To detect the specific allergen causing the reaction,a

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By injecting a very small dose of suspected allergens into the patient.

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(B) Allergies are exaggerated immune responses to certain antigens present in the environment. To detect the specific allergen causing the reaction,a common clinical method is to inject a very small dose of suspected allergens into the patient's skin (intradermal testing) and observe the reaction. If the patient is allergic,a localized inflammatory response (redness or swelling) will occur at the injection site. Exposing a patient to high levels of allergens (options $A$ and $C$) is dangerous and can trigger a severe,life-threatening reaction known as anaphylactic shock. Therefore,the standard diagnostic procedure is the controlled administration of small doses.

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