Inner part of the arm is pierced with a fine needle called lancet and liquid test solution is injected into the skin. 2 control tests consisting of one positive and one negative test are applied in order to determine the skin reactivity characteristics of the patient. Skin reactivity is measured with a ruler 15 minutes later. A small red circle indicates positive result. This finding is evaluated with the clinical data of patient. Patient should not use any allergy medication (antihistamines) for 20 days before the allergy test.