Allergy testing and immunotherapy are essential components of allergy treatment. They provide valuable information about the allergens that trigger immune responses and offer targeted treatments to relieve symptoms. These approaches are particularly beneficial for people with allergic conditions such as hay fever, hay fever, asthma, and allergic reactions to insect stings or certain foods. Allergy testing: Allergy testing is done to identify certain substances, called allergens, that cause an allergic reaction in a person. There are different methods of allergy testing. The two main methods are skin testing and blood testing.