What is 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 , 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 or "blood CO". This correlation allows for the level of CO in the blood to be indirectly measured through a breath sample.