Breath carbon monoxide

Breath carbon monoxide is the level of carbon monoxide in a person's exhalation. It can be measured in a breath carbon monoxide test, generally by using a carbon monoxide breath monitor (breath CO monitor), such as for motivation and education for smoking cessation and also as a clinical aid in assessing carbon monoxide poisoning. The breath carbon monoxide level has been shown to have a close relationship with the level of CO in the blood known as carboxyhaemoglobin (%COHb) or "blood CO". This correlation allows for the level of CO in the blood to be indirectly measured through a breath sample.