Quantitative allergen-specific IgE tests are conducted for a wide range of seasonal inhalants, non-seasonal inhalants, and other allergens. An allergic reaction happens when someone's immune system responds or overreacts to some foreign particles. Immunoglobulin E is an antibody which is produced to protect the body from this kind of foreign threat. These IgE antibodies are unique to each type of allergen, so checking before particular variants in the blood sample can determine the presence or absence of an allergen. Rats and mice have potential allergens in their hair and epithelium, which are originated from urine, skin-fur, and saliva. These allergens cause asthma, allergic rhinitis as well as allergic conjunctivitis.