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In a challenge test to determine allergies, a very small amount of an allergen is inhaled or taken by mouth. Challenges are done mostly with potential food or medication allergies. It is very important that they be supervised by an allergist / immunologist, often referred to as an allergist. An allergist has advanced training and experience in order to accurately and safely test and diagnose an allergic condition.

(Information only; not intended to replace medical advice; adapted from AAAAI)