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Table 5 Exhaled carbon monoxide values in non smoking healthy subjects reported in literature.

From: Effects of acute hypoventilation and hyperventilation on exhaled carbon monoxide measurement in healthy volunteers

Authors Exhaled CO level (ppm) N. Subjects
  Mean Range or S.D. or 95% C.I.  
Chatkin J. et al. (2007) [3] 4.30 ± 2.5 152
Cunnington and Hormbrey (2002) [34] 1.26 1.14-1.37 366
Deveci et al (2004) [27] 3.61 ± 2.15 55
Horvath et al. (2003) [32] 3.00 0.5-5.0 37
Laranjeira R. at al (2000) [35] 2.50 1.0 - 4.0 100
Montuschi et al. (2001) [9] 3.00 ± 0.3 10
Scharte et al. (2000) [36] 1.55 1.2-1.7 6