Substance guides
Blood tests for alcoholism: What doctors look for
Published January 28, 2025 · 7 min read · Updated April 2026
Reviewed for accuracy by licensed clinical professionals.
Several blood tests can indicate heavy alcohol consumption, even when the person denies or minimizes drinking.
Tests
GGT: most sensitive marker, elevated in 75% of heavy drinkers. MCV (mean corpuscular volume): enlarged red blood cells from folate deficiency. CDT (carbohydrate-deficient transferrin): highly specific for heavy drinking over 2+ weeks. Liver enzymes (ALT, AST): elevated with liver damage. Complete metabolic panel: liver function and nutritional status.
Clinical use
These tests help diagnose AUD, monitor treatment progress, and provide objective evidence of abstinence or continued use.
Frequently asked questions
How do I find help?
Call SAMHSA at 1-800-662-4357 or search our directory at treatmentassociation.com/directory.
Does insurance cover treatment?
Yes. Most insurance covers substance abuse treatment under the Mental Health Parity Act.
Is this treatable?
Yes. Addiction is a treatable medical condition. Recovery is possible at any stage.
Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.