It seems like there are so many things to potentially be allergic to. How does/could a lab determine what someone is allergic to?
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I recently had an allergy test done. Sometimes they test you by drawing blood, but when a more detailed test is needed they prick you with these little needles that have a very small amounts of different allergens on them. if you are allergic the spot they pricked you with will swell up and itch.
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