ALD (Alcohol-Associated Liver Disease) and MetALD (Metabolic Dysfunction- and Alcohol-Associated Liver Disease) are classifications for liver conditions, with ALD involving heavy drinking and MetALD defining liver disease in individuals with Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD) (formerly NAFLD) who also have moderate alcohol intake, creating an overlapping spectrum where metabolic factors and alcohol synergistically damage the liver.
And the PEth test can be a key part of the diagnostic regimen for AUD (AUD primarily stands for Alcohol Use Disorder, a medical condition where a person has trouble controlling their drinking, leading to significant problems in their life, even with negative consequences. It’s a brain disorder, previously called alcoholism or alcohol dependence, that can range from mild to severe and involves compulsive use, craving, and withdrawal symptoms, but it is treatable with therapies, medications, and support groups. ).
PEth (phosphatidylethanol) testing is a highly specific blood test that detects recent alcohol consumption over the past few weeks (typically 2-4 weeks) by measuring PEth, an alcohol-specific biomarker that forms in red blood cells when ethanol is present. It’s used for monitoring alcohol use, especially in medical contexts like liver transplant evaluations, and offers advantages over other markers as it’s not affected by medications or general health issues, and can be collected via a simple finger prick (dried blood spot) or traditional blood draw.
Here’s a summary of the Robert Gish, MD blog post “Broadening PEth testing for alcohol exposure in the Asia-Pacific region” (December 18, 2025), which adds important context–
Key Points
- PEth (phosphatidylethanol) is a blood biomarker that objectively measures recent alcohol intake, and was highlighted in a new expert panel position statement as a promising clinical tool.
- In addition to identifying alcohol exposure, PEth levels have been shown to predict major adverse liver outcomes, making it useful beyond simple detection.
- The blog recommends a triangulated approach to assessing alcohol use in patients with steatotic liver disease, combining:
- Self-reporting
- Validated questionnaires (e.g., AUDIT-C)
- PEth testing
This multi-method strategy improves accuracy in identifying harmful alcohol use.