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Ethanol concentration in serum or plasma (24-hour average)

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

This test measures the average amount of alcohol in your blood over the past 24 hours, typically used to assess heavy drinking patterns.

Quick summary

["Helps doctors check if you’ve consumed alcohol in amounts that may affect your health."]

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

Key facts at a glance

LOINC
32070-5
Short code
Ethanol Spec-sCnc
Synonyms
Ethanol Spec-sCnc
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 This Test Matters

Measuring ethanol concentration over time helps identify patterns of alcohol use, which can be important for diagnosing alcohol-related health issues or guiding treatment plans. Unlike a single blood alcohol test, this test provides a broader picture of your drinking habits.

What to Expect Before the Test

You may be asked to fast for a few hours before the test, but this isn’t always required. Bring any medications you’re taking, as some can affect lab results. Avoid alcohol for at least 24 hours before testing if possible.

How the Test Works

Blood is drawn from a vein in your arm. The sample is then analyzed using a sensitive method to detect alcohol in your bloodstream. The test measures the substance concentration (scnc) of ethanol in your serum or plasma.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL) or another concentration unit. Higher levels may indicate recent or frequent alcohol consumption, which can impact organs like the liver or brain.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Alcohol Level

Frequently asked questions

How often should I get this test?
This test is often used in research, clinical studies, or during treatment for alcohol use disorders. Your doctor may recommend it if you’re suspected of heavy drinking or if you’re evaluating symptoms linked to alcohol exposure, such as liver issues or cognitive problems.
What are the normal ranges?
There’s no single ‘normal’ range for a 24-hour ethanol test because it’s used to detect patterns rather than a single blood alcohol level. Very high levels may suggest severe alcohol misuse, while lower but consistent levels could indicate moderate use.
Can I drink alcohol before this test?
Avoid alcohol for at least 24 hours before testing to get an accurate result. If you’re unsure, ask your healthcare provider for guidance tailored to your situation.
  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