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Ethanol concentration in serum or plasma (quantitative measurement)

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

This test measures the amount of alcohol (ethanol) in your blood, typically done to check for recent alcohol use or intoxication.

Quick summary

["This test helps doctors assess alcohol exposure and guide treatment decisions."]

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

Key facts at a glance

LOINC
111062-6
Short code
Ethanol Msmt SerPl
Synonyms
Ethanol Msmt SerPl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you’ve been exposed to alcohol recently, if you’re suspected of being intoxicated, or if you’re undergoing treatment for alcohol use. It can also be part of routine monitoring for certain conditions or after accidents involving alcohol.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for a few hours before the test if it’s done as part of a larger blood draw, but this isn’t always required. Bring any medications you’re taking to your appointment.

What Happens During the Test?

A healthcare professional will draw a small amount of blood from a vein in your arm. You may feel a slight pinch, but it’s usually over quickly. The blood sample is then sent to a lab for analysis.

What Are the Results Mean?

Results are reported as the concentration of ethanol in your blood, measured in milligrams per deciliter (mg/dL). Higher levels may indicate recent alcohol consumption, while lower levels suggest abstinence or recent abstinence.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Ethanol Level

Frequently asked questions

How long does it take to get results?
Results are typically available within 24 hours, depending on lab processing times. Your healthcare provider will contact you once they have the results.
Can I drink alcohol before this test?
If this test is for detecting recent alcohol use, avoid drinking alcohol for at least 24 hours before the test to get an accurate reading. If it’s part of a routine check, your provider will give specific instructions.
What if my results are abnormal?
If your ethanol level is higher than expected, your doctor may discuss further steps, such as additional testing, counseling, or treatment options. If you’re concerned about your alcohol use, this test can help guide conversations with your healthcare provider about healthier habits.
  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