There is no accurate way to check allergens in the clinic, and you need to choose the right test according to the patient’s condition. The more accurate methods to check allergens are puncture test, patch test, blood test and so on. 1. Prick test: After injecting allergens into the dermis, the allergens combine with the corresponding IgE on the surface of mast cells in the tissues, which can release vasoactive substances such as histamine in a short time, causing the skin in the test area to produce a windy and blush reaction, so as to determine whether the patient is allergic to a certain substance. 2. Plaque test: A small grid with the sample to be tested is placed on the back, and the allergen is determined according to the reaction of the skin at the test site. 3. Blood test: mainly through the serum specific IgE measurement to check allergens, clinical suspicion of a certain food allergy can be used to assess the correlation between food and symptoms. It is recommended that patients who are prone to allergy should consult a doctor for allergen testing and standardized treatment under the guidance of a doctor.