Allergy is the immune system's reaction to unfamiliar substances, such as: some types of foods, pollen grains in the air, or poison from insect stings. To avoid allergic reactions and their symptoms, the comprehensive allergy test ALEX 2 provides a test for 295 types of allergens, including all food and air allergens or insect venom using inhibition-Ccd technology, which is done through a single blood sample with a highly accurate result.