In absence of clinical history of signs/symptoms of suspect hypersensitivity reaction (i.e.: urticaria or other typical muco-cutaneous manifestations, angioedema, hypotension, dyspnoea, simultaneous involvement of two or more organs/apparatus…) allergometric tests do not have any diagnostic value nor any predictive value for future allergic reactions.Any positive allergometric test, in absence of clinical history and/or signs/sympotms of suspect allergic reaction is just indicative of an immunological sensitization to the tested antige, and it doesn’t have any predictive value for future allergic reactions; on the other hand, any negative result is solely indicative of the current absence of sensitization, and it will not exclude any future allergic reaction.
The harms related to this procedure are: 1) non adequate therapeutical behaviours (including dietetical ones) which are potentially harmful because they can preclude the use of drugs or the intake of foods towards the patient is not allergic; 2) possible neo-sensitization induced by the tests themselves.