Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
Regular pulse oximeters can't detect carbon monoxide.
Why it's done
- Headache, dizziness, or nausea in several people in the same home, especially in winter
- Exposure to a fire, generator, or faulty heater
Getting ready and what happens
- Get fresh air and call 911 first.
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
| Result | Typical range for adults |
|---|---|
| Non-smokers | Below about 3% |
| Smokers | Up to about 10% |
Normal ranges vary from lab to lab and can differ by age, sex, and pregnancy. Your report lists your lab's own range next to each result. A result a little outside the range is often not a problem.
High
Treated with high-flow oxygen; severe cases may need a hyperbaric chamber.
When a result needs quick action
Call 911Suspected carbon monoxide exposure: get everyone outside and call 911
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related tests
Sources
Last updated 2026-11-13.