Respiratory allergies are frequent and the etiological diagnosis is not always easy. Most often, the allergy assessment is vital. For the allergist, this assessment begins with skin tests which must be complemented by measurement of the level of specific IgE in case of doubt. For the generalist or physician who does not have special competence in allergy, an alternative to a specialist consultation at once is a multi-allergen test of detection. This assessment is necessary to set out the etiological diagnosis and facilitate the responsibility of the therapy.