Available markers of excessive alcohol use

Area of Science:

• Clinical Biochemistry
• Toxicology
• Addiction Medicine

Background:

• Objective diagnostic tools for alcohol abuse are essential in clinical practice.
• Blood alcohol concentration is a common measure for acute intoxication.
• Biomarkers like MCV, AST, ALT, γGT, CDT, EtG, and PEth offer insights into alcohol consumption patterns.

Purpose of the Study:

• To review and evaluate various laboratory markers for diagnosing alcohol intake abuse.
• To assess the utility of different biomarkers in identifying chronic alcohol use and acute intoxication.
• To determine the most effective diagnostic strategies for alcohol use disorder.

Main Methods:

• Review of existing studies correlating alcohol consumption with laboratory marker levels.
• Analysis of the diagnostic value of mean corpuscular volume (MCV), AST, ALT, γGT, CDT, urinary EtG, and red blood cell PEth.
• Evaluation of marker effectiveness for acute intoxication versus chronic use monitoring.

Main Results:

• Elevated AST/ALT ratios (>2) suggest alcohol-related liver disease.
• Increased γGT levels are common in patients consuming >60 g/day ethanol.
• CDT levels rise with 60-80 g/day alcohol intake for 2 weeks and normalize with abstinence.
• Urinary EtG is detectable for up to 100 hours post-intake.
• PEth levels correlate with ethanol concentration and exposure time.
• γGT and CDT are key for monitoring abstinence; blood alcohol and urinary EtG for acute consumption.

Conclusions:

• No single laboratory marker reliably identifies all patients with alcohol abuse.
• A combined approach using multiple biomarkers is recommended for accurate diagnosis.
• Integrating laboratory findings with clinical history and questionnaires enhances diagnostic strategy.