Hydrogen/Expired gas^4H post XXX challenge:VFr:Pt:Exhl gas:Qn
hydrogen/expired gas^4h post xxx challenge:vfr:pt:exhl gas:qn
Hydrogen/Expired gas^4 hours post XXX challenge:Volume Fraction:To identify measures at a point in time:Exhaled gas (breath):Quantitative
hydrogen/expired gas^4 hours post xxx challenge:volume fraction:to identify measures at a point in time:exhaled gas (breath):quantitative