Alcohol level (quantitative) test
Quick answer: This test checks for alcohol (ethanol) and measures how much is present. Doctors use it in emergencies, when someone seems confused or unwell, or for medical and legal reasons.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed; tell staff about any medicines or mouthwash you have used.
How the test is done
- 1Staff confirm your identity and the reason for testing
- 2The skin is cleaned with a non-alcohol wipe so the result is not affected
- 3A needle draws blood into a sealed tube
- 4For legal requests, the sample may be sealed and signed for
What your results can mean
Reading your report
Your doctor will explain what the measured level means in your situation.
If the result is outside the usual range
A detected level shows that alcohol was taken recently, and the amount helps doctors judge how much it may explain symptoms such as confusion or drowsiness. The level falls over hours, so timing matters.
Who usually has this test
People in emergencies with confusion or drowsiness, and people who need testing for medical or legal reasons.
Risks and aftercare
There may be a small bruise where the needle went in.
Names and options
Also called: blood alcohol, ethanol level
Listed by the hospital as
- ALCOHOL (QUANTITATIVE)
Questions about this test
How long does alcohol stay in the blood?
It depends on how much was taken, body size, food and liver health. The body usually clears it over several hours, so a blood test reflects recent use.
Can mouthwash or hand sanitiser affect a blood alcohol test?
Using them does not usually raise a blood level much, but tell staff if you have used them. Labs clean the skin with a non-alcohol wipe for this test.
Is a blood alcohol test different from a breath test?
Yes. A blood test measures alcohol directly in blood, while a breath test estimates it from air you breathe out. Blood tests are often used in hospitals and for formal records.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.