[Efficacy of gas exchange in the lung of children (author's transl)].

Determination of the CO transfer through lungs is the most direct method of determination of lung function. In children more convenient for practical use is the "steady state" than the "single breath" method. Besides classical coefficient of transfer (TLCO) interpretation of results may be widened by coefficients of the CO fractional uptake - global (FUCO) and partials, informing about exchange of gases in airways (FUCO) and in alveolies (FUaCO) the predicted values of the above coefficients should be calculated, accordingly to the opinion of authors, in relation with tidal volume (TV) or with total lung capacity (TLC), but FUCO and FUaCO with frequency of breathing (f). Cited examples of clinical results prove practical usefulness of application the "steady state" method in children.