A total of 71 patients with bronchial asthma (BA) were examined and treated based at a specialized health facility of whom 43 ones presented with mild asthma and 26 patients with moderately severe asthma in remission. The median age of the patients was 12,04±2,08 years. Spirometry parameters: MOS50, MOS75, and PSV, proved to be of high informative value combined with high enough sensitivity and specificity. The significant difference between the groups as a whole (p<0,05) were documented based on the serum leptin levels that were higher in the overweight patients and especially in the girls (p<0,05). The leptin level was a similarly sensitive/specific (AUROC 0.5) and informative (SCDFC >0.5) parameter which confirms its diagnostic value given it is employed in combination with overweight for the evaluation of the status of the patients suffering from asthma. Negative linear and non-parametric correlation between the functional parameters and the serum leptin levels in the overweight patients with bronchial asthma suggests that the enhanced leptin concentration may serve as a marker of strong obstruction and severe inflammation at all levels of the respiratory tract in the patients presenting with a combination of the two conditions.