In the group of asthmatic patients the analysis of interrelation between the separate characteristics FER and answer FER on stimulation fenoterol and adrenalin was made. For fenoterol such connection is revealed with initial parametres, as ERV, FEF.2-1.2, FIVC. For adrenalin those have appeared FVC, VC, FEV.5, FEV 1, FEV 3, FEF.2-1.2, FEF 25%, PEF.

Using as the criterion of the efficiency of the adrenostimulation of the various parametres (FEV 1, FEF 75%) brought different estimated results.