Dead space and blood gases.
D002000:Bronchospirometry; D002245:Carbon Dioxide / Q000097:blood*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007204:Indium; D007457:Iodine Radioisotopes; D010100:Oxygen / Q000097:blood*; D011868:Radioisotopes; D012126:Respiratory Dead Space; D013667:Technetium; D014978:Xenon
D007457:Iodine Radioisotopes; D011868:Radioisotopes; D007204:Indium; D002245:Carbon Dioxide; D014978:Xenon; D013667:Technetium; D010100:Oxygen