The study plans to enroll 100 children with a confirmed diagnosis of bronchial asthma of varying severity. Patients will be divided into groups based on disease severity (mild and severe/moderate) and stage (exacerbation/non-exacerbation). A separate group of patients receiving targeted therapy will also be included. All patients will be hospitalized in the pulmonology department. Blood and urine samples will be collected for metabolomic analysis upon admission. Patients not experiencing an exacerbation will not be re-evaluated. For patients experiencing an asthma exacerbation, blood and urine samples will be collected again after 10 days. Throughout the study, patients will receive the usual therapy prescribed by their treating physician. Treatment for exacerbations includes inhaled budesonide and ipratropium bromide/fenoterol via a nebulizer; systemic steroids may be used if indicated. All patients will undergo spirometry upon admission to the department. Patients in the acute stage will undergo spirometry at least twice, including on the 10th day, plus or minus 2 days. All patients complete the Asthma Control Test questionnaire upon admission.
