100s: There are literally hundreds of allergens that can be used in skin/scratch testing, and each presents a specific allergy-inducing substance to the patient's body to see if it is sensitized to react to it or not. Specific tree or plant pollens, grasses, foods, pets, dusts, mites, etc. Exact spectrum is ordered by allergist after thorough history of your symptoms and triggers.
Answered 5/7/2013
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