Exhaled Carbon Monoxide Concentration Less than 5 ppm

**Semantic type:** Laboratory or Test Result

**Definition:** An indication that the concentration of carbon monoxide (CO) in a sample of exhaled air is less than 5 ppm.

**Synonyms:** - Exhaled CO Less than 5 ppm - Exhaled CO Level < 5 ppm - Exhaled Carbon Monoxide Less than 5 ppm - Exhaled Carbon Monoxide Level Less than 5 ppm