What Is an EtG Test? Ethyl Glucuronide Testing Explained

What is an EtG test? An EtG test is a urine test that screens for ethyl glucuronide, a metabolite the body produces after drinking alcohol. Because EtG stays in urine much longer than alcohol itself, an EtG test can show that someone has been drinking even when they are no longer under the influence.

ARUP Consult estimates that ethanol, measured as EtG and its companion marker EtS, can be detected in urine for about 1–4 days.

That longer look-back is why EtG testing is widely used in treatment programs, sober living homes, drug courts and probation, where the goal is to confirm abstinence rather than measure current intoxication.

This guide explains what ethyl glucuronide is, how EtG tests work, what EtG cutoffs mean, how incidental alcohol exposure affects results, and how to choose between single-panel EtG tests and multi-panel cups that include EtG.

What Is Ethyl Glucuronide (EtG)?

Ethyl glucuronide (EtG) is a direct metabolite of ethanol. When a person drinks, the liver breaks down most of the alcohol, but a small portion is combined with glucuronic acid to form EtG. A related metabolite, ethyl sulfate (EtS), forms by a different pathway.

Both markers are produced only when the body processes alcohol. That makes them more specific to alcohol consumption than indirect markers such as liver enzymes, and it is why they are used for abstinence monitoring.

How Long Does an EtG Test Detect Alcohol?

ARUP Consult lists an estimated urine detection window of 1–4 days for ethanol measured as EtG and EtS in its drug half-lives and urine detection windows table. ARUP notes that these windows are estimates and that many factors affect them.

The window in practice depends on:

• How much was consumed – heavier drinking produces more EtG.
• Drinking pattern – repeated drinking can extend detection.
• Test cutoff – lower cutoffs detect smaller amounts for longer.
• Urine concentration – dilute urine lowers the measured level.

For a broader look at alcohol timing, including how long alcohol itself stays in urine, see How Long Does Alcohol Stay in Urine?

EtG Test vs Breathalyzer vs Blood Alcohol Test

A breathalyzer and an EtG test are not interchangeable. Programs that need to know whether someone is impaired at the moment use breath or blood testing. Programs that need to monitor abstinence over several days use EtG. The MedlinePlus blood alcohol test page explains the shorter blood window.

What Does an EtG Cutoff Mean?

The cutoff is the concentration above which a rapid test reads preliminary non-negative. Our EtG products list two cutoffs:

• 300 ng/mL – our EtG alcohol test strips, the EtG test cartridge and many multi-panel cups.
• 500 ng/mL – our single-panel EtG/500 dip card.

A lower cutoff picks up smaller amounts of EtG and can extend the detection window. It is also more likely to flag low-level exposure from non-beverage sources. A higher cutoff reduces those flags but can miss lighter or less recent drinking.

There is no universal standard cutoff. An article from the National District Attorneys Association notes that labs and programs use different thresholds and that results of 1,000 ng/mL or higher are unlikely to come from extraneous exposure. Choose the cutoff that matches your written policy and keep it consistent.

If your program also uses laboratory testing, keep in mind that a laboratory may report EtG at concentrations below a rapid test’s cutoff. A sample can screen negative on a 500 ng/mL dip card and still contain measurable EtG in a laboratory report. Compare rapid and laboratory results only when you know the cutoff each one used.

Incidental Alcohol Exposure and EtG

EtG tests are sensitive enough to detect alcohol from sources other than drinks. The NDAA article lists mouthwash, certain medicines, household cleaners and disinfectants, lotions, body washes, perfumes and colognes as possible sources.

Good practice for programs that use EtG includes:

• Giving participants a written list of alcohol-containing products to avoid.
• Asking about product use before collection.
• Treating low positive results with caution.
• Using laboratory confirmation before acting on a disputed result.

What Does an EtG Test Look Like?

Rapid EtG tests come in several formats:

• Dip strips and dip cards – dipped into urine collected in a separate cup.
• Test cartridges – a pipette places urine on a sample well.
• Multi-panel cups – EtG appears as one strip labeled EtG alongside the drug panels.

On every format, the EtG result uses a control line (C) and a test line (T). Both lines mean negative, even if T is faint. Only the control line means preliminary non-negative. No control line means the test is invalid. Our guide to reading a drug test cup explains faint lines in more detail.

Single-Panel EtG Test or Multi-Panel Cup?

Programs that already run a urine drug screen usually find it easier to add EtG through a multi-panel cup. Programs focused only on alcohol often prefer single-panel EtG tests because the cost per test stays low.

EtG Confirmation Testing

A rapid EtG result is preliminary. Laboratory testing measures EtG and EtS quantitatively by liquid chromatography-tandem mass spectrometry, which ARUP lists among its alcohol biomarker tests. Measuring EtS alongside EtG adds information, and a quantitative value helps distinguish heavier drinking from low-level exposure.

Confirmation is especially important when a result is disputed, when it is near the cutoff, or when it could lead to sanctions, discharge or other significant decisions.

What an EtG Result Does Not Tell You

An EtG result cannot show:

• The exact time of drinking.
• The amount of alcohol consumed.
• Whether the person is currently impaired.

EtG results should be interpreted alongside the program’s policy, the participant’s account and, where needed, laboratory confirmation.

Where EtG Testing Is Used

EtG testing fits programs where alcohol abstinence is part of the agreement:

• Addiction treatment – outpatient, IOP and residential programs monitor alcohol alongside other substances.
• Sober living and recovery residences – operators use EtG to enforce no-alcohol house rules.
• Drug courts, probation and parole – supervision conditions often prohibit alcohol use.
• Professional health programs – licensed professionals in monitoring agreements may be tested regularly.
• Medication-assisted treatment – clinics may monitor alcohol because combining alcohol with some medications increases risk.

How to Set Up an EtG Testing Program

A consistent process makes EtG results easier to defend and compare:

1. Write the policy first. State whether alcohol is prohibited, which cutoff you use and what happens after a non-negative result.
2. Choose one cutoff and one format. Mixing 300 ng/mL and 500 ng/mL tests makes results harder to compare.
3. Inform participants about incidental exposure. Provide a list of alcohol-containing products to avoid.
4. Set a testing frequency. Because the window is about 1–4 days, testing every few days gives more continuous coverage than weekly testing.
5. Define a confirmation pathway. Decide in advance when a result goes to a laboratory for EtG and EtS confirmation.
6. Document every result. Record the product, lot number, cutoff and reading time.

For volume orders of EtG strips, dip cards or cups with EtG, request a bulk quote with your monthly quantity and preferred format.

Frequently Asked Questions

What is an EtG test?

An EtG test is a urine test that screens for ethyl glucuronide, a metabolite formed when the body processes alcohol. It can detect recent drinking for about 1–4 days, according to ARUP Consult, which is longer than alcohol itself stays in urine.

What does EtG stand for?

EtG stands for ethyl glucuronide. It is a direct metabolite of ethanol that forms only when the body breaks down alcohol, which is why it is used for abstinence monitoring.

How long does an EtG test detect alcohol?

ARUP Consult estimates a urine detection window of about 1–4 days for EtG and EtS. Heavier or repeated drinking and lower cutoffs can extend detection, so the window is an estimate.

What is the cutoff for an EtG test?

There is no single standard cutoff. Our EtG test strips and many multi-panel cups list 300 ng/mL, and our single-panel EtG dip card lists 500 ng/mL. Always check the product you use.

Can an EtG test be positive without drinking?

Low EtG levels can result from exposure to alcohol-containing products such as mouthwash or some cleaners. Results of 1,000 ng/mL or higher are unlikely to come from extraneous exposure alone, and low results should be confirmed before action is taken.

Does an EtG test show if someone is drunk?

No. An EtG test shows that alcohol was consumed or encountered in recent days. It does not measure current impairment. Breath or blood alcohol testing is used to assess current intoxication.