Allergy is a specific response of the immune system to certain external factors. In the course of this response, various accompanying symptoms can be encountered, including allergic rhinitis, which is the most common manifestation of this condition. In terms of chronicity, it is likely that children suffering from this condition are at risk of developing bronchial asthma. It is therefore very important to monitor the performance of the respiratory system by means of spirometry, a test that shows the ventilation performance of the respiratory system.