Abstract: Objective  To explore the relationship between impulse oscillometry and lung plethysmography, both of which can detect airway resistance(Raw),  for more evidence in clinic application and standardization. Methods  A total of 217 subjects were enrolled and conducted on Raw tests through impulse oscillometry and lung plethysmography respectively and the results were compared. Results  The correlation analysis showed that the Raw measured by impulse oscillometry was positively correlated with that of lung plethysmography (P<0.01). The Raw results (R20) were not statistically different between impulse oscillometry measurement and lung plethysmography measurement(P>0.05). Then, Raw(R5) displayed statistical difference between the two groups(P<0.01). Conclusion  The Raw measured by impulse oscillometry was consistent with that measured by lung plethysmography. Being easy to operate and read, and economic, the impulse  oscillometry providing allround information is necessary and useful supplement to traditional lung function test worth widespread use.

Key words: impulse oscillometry, plethysmography, respiratory function tests, airway resistance