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What is a skin test? How does it work? A skin test detects the presence of antibodies to a particular allergen, a substance that causes an allergic reaction. A positive test suggests that you may have an allergy to the particular substance. However, your doctor will review your skin-test results, your medical history and conduct a physical exam to confirm which allergens are causing your symptoms. A skin test is performed by first placing a drop of allergen extract on the skin, then the skin is pricked with a needle. If you have a positive reaction to the extract, a red welt will appear on your skin in about 15 minutes. The size of the welt may indicate the strength of the reaction. If you do not react to the extract you are most likely not allergic to the substance.
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Cockroach allergies can cause sneezing, wheezing, itchy eyes, cough and other symptoms common to allergic rhinitis. As in other common allergies, symptoms can range from mild to severe. But cockroach allergies may have especially dangerous health consequences to children. One study showed that kids who were allergic to cockroaches were hospitalized for asthma 3.3 times more often than other children—including children with allergies to dust mites or cats. Twenty-three percent to 60 percent of city dwellers with asthma are allergic to cockroaches. Some researchers believe that the rise in cases of asthma among urban children is due to increased contact with cockroach allergens, especially since kids play indoors more than they used to. Proteins in cockroach feces, saliva and bodies are thought to be the major culprit in triggering allergic responses.
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One characteristic of all drug allergies is that similar symptoms will occur every time soon after the offending medicine is taken. Penicillin and other antibiotics are the medicines that most commonly cause allergic reactions. Women appear to have an increased risk for adverse drug reactions.
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