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Allergy testing
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== Skin test == Skin testing for allergies can come in a variety of forms: a skin prick test, also called a puncture or scratch test; a skin injection test; or a patch test.<ref name=":1">{{Cite web | url = https://www.mayoclinic.org/tests-procedures/allergy-tests/about/pac-20392895 | title = Allergy skin tests - Mayo Clinic | website = Mayo Clinic | access-date = 2019-02-26}}</ref> === Skin prick test === Skin prick testing tests for allergic reactions to as many as 40 different substances by lightly pricking the skin with the potential allergens, using a new lancet for each substance. These scratches are superficial and only briefly uncomfortable; they do not draw blood. The test compares the skin's reaction to these substances to two controls: [[histamine]] and either [[glycerin]] or [[saline]]. Histamine typically prompts a skin reaction; if it does not, the rest of the testing may produce [[False negative|false negatives]]. On the other hand, most people will not react to either glycerin or saline. If you do, this skin sensitivity make cause [[False positive|false positives]] in the rest of your testing and any positive results will be interpreted cautiously.<ref name=":1" /> Results take about 15 minutes and an allergic reaction indicated by a raised, red, itchy bump ([[wheal]]) at the site, which the provider performing the test will measure.<ref name=":1" /> === Skin injection test === === Patch test ===
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