Carbon Monoxide (CO) Test

Gas exchange in the lungs, Opens dialog

Test Overview

A carbon monoxide blood test is used to detect carbon monoxide poisoning, Opens dialog. Poisoning can happen if you breathe air that contains too much carbon monoxide (CO). This gas has no color, odor, or taste, so you can't tell when you are breathing it. The test measures the amount of hemoglobin, Opens dialog in your blood that has bonded with carbon monoxide.

Carbon monoxide can come from any source that burns fuel. Common sources are cars, fireplaces, powerboats, woodstoves, kerosene space heaters, charcoal grills, and gas appliances such as water heaters and ovens. These things usually cause no problems. But if they are not used or installed properly, carbon monoxide may build up in an enclosed space.

When you inhale carbon monoxide, Opens dialog, it replaces the oxygen that is normally carried by the hemoglobin in your red blood cells. As a result, your brain and other tissues get less oxygen. This can cause serious symptoms or death.