The number of shots required for allergy testing can vary depending on the type of test and the individual being tested. Skin prick tests, which are the most common type of allergy test, usually involve exposing the skin to a small amount of several different allergens at once. This can result in multiple reactions on the skin, each of which represents a potential allergy. The number of allergens tested will depend on the individual's history and the doctor's assessment of what is likely to cause an allergic reaction. Blood tests, such as the RAST test or the ELISA, do not require any shots. Instead, a small blood sample is taken and sent to a laboratory for analysis. Immunotherapy may also be recommended for individuals with severe or persistent allergies. This treatment involves injecting gradually increasing doses of an allergen over a period of time in order to build up a tolerance to the substance. The number of shots required for immunotherapy varies depending on the severity of the allergy, the response to treatment, and the individual's specific situation.