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Updated: Jul 13, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
Published on: January 29, 2011
Exhaled carbon monoxide concentration is not elevated in patients with inflammatory bowel disease
H Nitta1, M Kinoyama, F Teramoto
1Department of Clinical Nutrition, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama 701-0193, Japan.
Abstract:
The present study was initiated to examine whether the concentration of CO in the breath is elevated in patients with inflammatory bowel disease (IBD). Twenty-three clinically stable patients with IBD in the outpatient clinic (11 with Crohn's disease, 12 with ulcerative colitis), who are non-smokers and non-passive smokers, were selected and the concentration of CO in their breath was measured using a breath gas analyser (TRI lyser mBA-3000). The concentration of CO in the breath of 23 patients with IBD was 2.5+/-0.9 (1.1-4.3) ppm. This concentration comes within the range of standard values in our previous reports (2.5+/-2.2 ppm). Any significant difference was not observed between 2.4+/-0.9 (1.5-4.3) ppm for the 11 Crohn's disease patients and the 2.6+/-1.0 (1.1-3.9) ppm for the 12 ulcerative colitis patients. The results suggest that clinically stable patients with IBD do not show high values for concentration of CO in the breath.
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