title: Helium method for determining gas retained in the lung during quiet breathing.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D006371:Helium; D006801:Humans; D008176:Lung Volume Measurements / Q000379:methods*; D008875:Middle Aged; D012140:Respiratory Tract Diseases / Q000503:physiopathology; D013147:Spirometry
chemical_list: D006371:Helium