AI Summary The alcohol biomarker urine test looks for ethyl glucuronide (EtG), a byproduct of alcohol, to show recent drinking, up to 80 hours back. It needs only a urine sample, and cirrhosis does not affect the result. Doctors use it in alcohol-related liver disease and transplant follow-up. It shows recent alcohol use, not how much you drank or how your liver is doing. Your care team reads it with other tests and plans treatment, safe withdrawal, and support.
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The alcohol biomarker urine test looks for ethyl glucuronide (EtG). Your body makes EtG when it processes alcohol, so finding it in urine shows that alcohol was in your body in the past few days.
Doctors use this test in the care of alcohol-related liver disease. It gives your care team an objective lab result to add to what you tell them about your drinking.
The test needs only a urine sample. Below, you will find key facts, why doctors order it, what to expect, how it compares with other alcohol markers, how to read a result, and answers to common questions.
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Urine EtG Test Basics
An alcohol biomarker urine test measures a substance in your urine that shows you have had alcohol. The substance is ethyl glucuronide (EtG). Doctors may call the test a urine EtG test or urinary EtG (uEtG).
EtG is a direct biomarker. That means it comes from the way your body processes alcohol itself. Doctors consider EtG a highly specific direct marker. Indirect markers, such as the liver enzyme GGT and the red blood cell measure MCV, show how alcohol may be affecting your body. They are less specific to alcohol.
The test matters most in alcohol-related liver disease (ARLD), also called alcohol-associated liver disease. Sustained abstinence is the cornerstone of treatment at every stage. A urine test can support that goal.
This page covers the urine test. For the full group of alcohol markers, including blood and hair tests, see Alcohol Biomarker Testing. For other tests in the same group, see Specialized Urine Testing.
Reasons for Alcohol Testing
Stopping alcohol matters for people with cirrhosis. Those who keep drinking are not eligible for a liver transplant. Transplant teams therefore pay close attention to alcohol use, and testing may be part of that follow-up. Your transplant center will explain what it requires.
Alcohol Marker Comparison
| Marker | Sample | Type | What it shows |
|---|---|---|---|
| Urinary EtG | Urine | Direct | Alcohol use in the past 80 hours or less. Not influenced by cirrhosis. |
| Hair EtG | Scalp hair | Direct | Long-term pattern, up to six months. Each 1 cm segment reflects about one month. |
| GGT | Blood | Indirect | How alcohol may be affecting the body. Less specific to alcohol than EtG. |
| MCV | Blood | Indirect | A red blood cell measure that may change with alcohol. Less specific than EtG. |
Blood-based alcohol markers such as PEth and CDT are covered in Alcohol Biomarker Testing. Your doctor chooses the marker that fits your situation.
Urine Test Preparation
The test needs only a urine sample. There are no needles, imaging, or radiation. Your clinic or lab will tell you when and where to give the sample. Follow its instructions exactly.
Tell your care team about all medicines and products you use, and ask whether anything could affect the result. If you have questions about how the sample is collected, ask before you give it.
Your care team will explain how and when you will receive the result, and what it means for your plan. Ask whether you will need repeat tests, and how often.
Interpreting EtG Results
A positive result means alcohol was in your body in the recent past. Urinary EtG can detect alcohol use for up to 80 hours. The test does not show how much you drank, and it does not show how your liver is doing.
A negative result suggests no recent alcohol use. It does not cover drinking from more than a few days ago. For a longer view, your doctor may use other markers, such as EtG in scalp hair, which can track up to six months.
One result is never a full answer. Your care team reads it with your history, symptoms, blood tests, and imaging. Labs set their own cutoff values, so ask your clinic how your lab reports results. If a result surprises you, tell your doctor. They can discuss it with you and decide whether to repeat or add another test.
Follow-Up and Treatment Options
The test itself does not treat anything. What matters is the care plan around it.
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Common Questions
Urinary EtG can detect alcohol use for up to 80 hours. That is a little over three days. Because the window is short, a negative result does not cover drinking from earlier than that. Lab methods and cutoffs vary, so ask your clinic how its test is reported. For a longer view, your doctor may use EtG in scalp hair, which can track drinking for up to six months.
No. Cirrhosis does not influence urinary EtG. That is why the test stays useful in advanced liver disease. It is also one reason the test is considered superior to indirect markers such as GGT or MCV. Those markers show how alcohol may be affecting the body, and they are less specific to alcohol. The test cannot show how your liver is doing. Your care team uses other tests for that.
Not exactly. A routine urinalysis checks your urine for signs of health problems such as infections, kidney problems, diabetes, and liver disease. It often uses a dipstick with chemical strips that change color. One dipstick can check several things at once, such as bilirubin, protein, and glucose. A urinalysis may also include a visual and a microscopic exam. The EtG test looks for one thing: EtG, a byproduct of alcohol. See Urinalysis for the routine test.
A positive result tells your doctor that alcohol was in your body within the past few days. The detection window is up to 80 hours. The test does not show how much you drank, and it does not show how healthy your liver is. Your care team reads the result with your history, symptoms, blood tests, and imaging. If a result surprises you, tell your doctor. They can discuss it with you and decide whether to repeat the test or add another.
Only your care team can say, because it depends on your plan and liver stage. Some people are tested at set times during treatment or transplant follow-up. Urinary EtG covers only the past few days, so one result is a snapshot, and repeat testing may be part of a plan. Ask your clinic what schedule fits you and how it will share your results.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.
