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Ethanol mass concentration in serum or plasma (24-hour urine collection)

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

This test measures the total amount of alcohol (ethanol) consumed over a 24-hour period, often used to assess heavy drinking or compliance with sobriety programs.

Quick summary

["Helps track alcohol intake for medical or legal reasons, such as sobriety monitoring or identifying patterns of heavy drinking."]

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

Key facts at a glance

LOINC
35664-2
Short code
Ethanol ?Tm Ur-mCnc
Synonyms
Ethanol ?Tm Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Matters for Your Health

Alcohol consumption can affect your liver, brain, and overall health. This test provides a broader picture of your alcohol exposure compared to single blood or breath tests, helping healthcare providers assess risk or compliance with treatment plans.

How the Test Works

Your urine is collected over 24 hours. The test measures the total ethanol present, which reflects all alcohol consumed during that period. This method is less affected by recent drinking spikes compared to blood tests.

What to Expect Before the Test

No special preparation is needed, but you may be asked to provide a urine sample at the start and end of the 24-hour period. Drink plenty of fluids to ensure adequate urine production.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL) or grams per liter (g/L). Higher values may indicate heavy drinking, which can lead to health risks like liver damage or addiction. Always discuss results with your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Alcohol Use and Health Risks

Short name

24-Hour Alcohol Urine Test

Frequently asked questions

How often do I need this test?
This test is often used periodically to monitor alcohol use in patients undergoing treatment for alcohol use disorder, those recovering from alcohol withdrawal, or individuals with suspected heavy drinking. Your healthcare provider will determine how frequently it’s needed based on your situation.
Can I drink alcohol before the test?
Yes, but the test measures total ethanol over 24 hours. If you consume alcohol, it will be included in the measurement. Avoid excessive alcohol use if this test is part of a sobriety or treatment program.
What if my results are above the normal range?
If your results are elevated, your healthcare provider may discuss further steps, such as adjusting treatment plans, recommending counseling, or exploring other diagnostic tests to assess alcohol-related health risks.
  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