Allergies occur when your immune system reacts to a foreign substance. Phadiatop deals with those allergens which you inhale like pollen, hair of cats, horses & dogs, house dust etc. You usually develop symptoms like red irritated eyes, constant sneezing, runny nose & chest congestion. In addition this test measures your total Immunoglobulin E levels in the body which if raised indicates that you are likely to develop allergies.