New research has shown that a urine test can determine if a person has a severe allergy to a specific substance, such as ragweed. Patients would sniff the allergen then provide a urine sample. In the future, this test could serve as a partial replacement for the itchy skin prick test.

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New research has shown that a urine test can determine if a person has a severe allergy to a specific substance, such as ragweed. Patients would sniff the allergen then provide a urine sample. In the future, this test could serve as a partial replacement for the itchy skin prick test.