An allergy test is an examination procedure that aims to detect whether a patient's body has an allergic reaction to certain substances or substances (allergens). Allergy tests can be done in the form of blood tests or skin tests. This examination procedure is generally carried out by an allergic consultant doctor. Allergies occur when the immune system produces excessive reactions to allergens found in the surrounding environment. Allergic reactions produced by the body vary, ranging from mild symptoms to anaphylactic reactions that can be life-threatening. Mild allergic reactions that commonly occur include sneezing, nasal congestion, itching, and runny eyes and nose. Types of substances that cause allergies (allergens) Allergens are substances, substances, or substances that cause allergies. Generally, there are three types of allergens, namely: Inhale allergens. Allergens that can trigger allergic reactions in the body when inhaled and interact with the lining of the no