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Ethanol concentration in blood (serum or plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of alcohol (ethanol) in your blood, often checked after drinking or if you suspect alcohol use.

Quick summary

["Knowing your blood alcohol level helps doctors assess alcohol exposure and guide treatment or safety decisions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
15120-9
Short code
Ethanol Bld-sCnc
Synonyms
Ethanol Bld-sCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test to evaluate recent alcohol consumption, assess intoxication, monitor alcohol dependence, or check for alcohol-related health risks. It can also be used in legal or workplace settings to determine impairment.

What to Expect During the Test

A small blood sample is taken from a vein, usually in your arm. You may feel a slight pinch, but it’s quick. The sample is sent to a lab for testing.

How the Results Are Interpreted

Results are typically reported in milligrams of alcohol per deciliter (mg/dL) of blood. Higher levels may indicate recent heavy drinking or intoxication.

Common Uses and Considerations

This test is often used in emergency settings, addiction treatment, or to monitor chronic alcohol use. It’s important to note that results can vary based on factors like metabolism, hydration, and recent food intake.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Elevated ethanol levels may indicate acute alcohol intoxication, alcohol misuse, or recent heavy drinking. Chronic high levels can contribute to alcohol-related health issues like liver damage or addiction. Results may also be used in legal or medical evaluations to assess impairment or compliance with sobriety requirements.

Short name

Blood Alcohol Level (BAL)

Frequently asked questions

What does a positive result mean?
A positive result means alcohol is detected in your blood. The exact meaning depends on the context (e.g., recent drinking, legal testing, or medical evaluation). Always discuss results with your healthcare provider.
How long does it take to get results?
Results are usually available within 24 to 48 hours, depending on lab processing times. Your provider will contact you once they’re ready.
Can I drink before this test?
If this test is for recent alcohol assessment (e.g., intoxication), avoid drinking before testing. If it’s for monitoring chronic use, follow your provider’s instructions, as fasting or timing may affect results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy