Ethanol (Alcohol) Concentration in Urine

Why Is This Test Done?

Doctors may order this test to evaluate recent alcohol intake, monitor sobriety after treatment for alcohol use disorder, or screen for alcohol misuse in certain settings like workplace or legal situations. Urine tests can also detect alcohol in the body for up to 24–48 hours after consumption, depending on hydration and metabolism.

How Is the Test Performed?

You’ll provide a urine sample in a sterile container. The lab uses a sensitive method to measure the alcohol concentration. This is typically done through a chemical reaction that detects ethanol without needing a specific reference range.

What Do Results Mean?

Results indicate the presence and approximate amount of alcohol in your urine. A positive result means alcohol was detected, but the exact amount isn’t always reported unless specified. Higher levels may suggest heavier or more recent drinking.

Common Causes of Abnormal Results

False positives can occur if you’ve consumed alcohol, used certain medications, or had exposure to alcohol-containing products (like some mouthwashes or cosmetics). False negatives may happen if you’re dehydrated or the test window has passed.