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
It's used in emergencies and for legal reasons. Breath tests estimate the same thing.
Why it's done
- Confusion, injury, or possible alcohol poisoning
Getting ready and what happens
- None.
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 |
|---|---|
| Legal driving limit (most states) | 0.08% (80 mg/dL) |
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
Very high levels can slow breathing and cause unconsciousness.
When a result needs quick action
Call 911Can't be woken, slow or irregular breathing, vomiting while passed out, or seizures
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.