Description
The Phosphatidylethanol (PEth) Blood Test measures PEth, a direct biomarker formed in the blood only in the presence of alcohol (ethanol). Unlike traditional tests such as liver enzymes or self-reported drinking, PEth is highly specific and sensitive, allowing detection of alcohol consumption over the past 2–3 weeks.
This test is widely used to monitor alcohol abstinence, assess alcohol-related risk, and support clinical decision-making for patients in treatment programs or healthcare settings.
What This Test Measures
- PEth (Phosphatidylethanol):
- A lipid molecule formed in red blood cell membranes when alcohol is consumed. The concentration of PEth correlates with amount and frequency of alcohol intake.
- Detection Window:
- PEth can detect alcohol use typically within the last 2–3 weeks, making it more reliable than urine or breath tests for identifying recent drinking patterns.
Why This Test May Be Ordered
- Monitoring alcohol abstinence programs
- Screening in clinical or occupational settings
- Assessing alcohol-related health risks
- Supporting treatment for liver disease, addiction, or mental health conditions
- Confirming self-reported alcohol intake when accurate monitoring is required
Key Benefits of PEth Testing
- Highly specific to alcohol—no false positives from medications or foods
- Longer detection window than urine or breath testing
- Useful in both clinical and forensic settings
- Can guide treatment decisions and track patient compliance
Test Details
- Sample Type: Blood draw
- Fasting Required: No
