Simultaneous single-breath measurements of foreign gases in lung and expired air.
D000328:Adult; D005260:Female; D006371:Helium; D006801:Humans; D006859:Hydrogen; D008168:Lung / Q000502:physiology*; D008297:Male; D012119:Respiration; D013147:Spirometry; D014797:Vital Capacity
D006371:Helium; D006859:Hydrogen