Hydrogen/Expired gas^1H post XXX challenge:VFr:Pt:Exhl gas:Qn
hydrogen/expired gas^1h post xxx challenge:vfr:pt:exhl gas:qn
Hydrogen/Expired gas^1 hour post XXX challenge:Volume Fraction:To identify measures at a point in time:Exhaled gas (breath):Quantitative
hydrogen/expired gas^1 hour post xxx challenge:volume fraction:to identify measures at a point in time:exhaled gas (breath):quantitative