ETG Calculator

Ethyl glucuronide (EtG) tests are a type of alcohol screening that can detect the presence of alcohol in a person’s system for a longer period than traditional alcohol tests. Unlike standard tests that measure the actual alcohol content in the blood or breath, EtG tests identify the presence of EtG metabolites, which are byproducts of alcohol metabolism. These metabolites can remain in the body for up to 80 hours after alcohol consumption, making EtG tests a useful tool for monitoring abstinence in alcohol treatment programs, legal cases, and employment screenings.

gray etg calculator with title in the window

The primary difference between EtG testing and regular alcohol screening lies in their detection windows and what they measure. Traditional alcohol screenings, such as breathalyzers or blood alcohol content (BAC) tests, typically detect alcohol only for a few hours up to a day after consumption, depending on the amount of alcohol consumed and the individual’s metabolism. These tests measure the active presence of alcohol in the system. In contrast, EtG tests do not measure the alcohol itself but rather the EtG metabolites, offering a longer detection window and the ability to infer alcohol intake days after the actual drinking event.

How to use

Here are step by step directions on how to use this EtG calculator.

First: Under the heading “Day” click on the word “Select” and use the drop-down menu to choose the day of the week the person completely stopped consuming alcohol.

Second: Under the heading “Time” click on the clock over on the far right side (see arrow), then pick the time, in hour and minutes, when they quit drinking on that day.

illustration of where to find the clock in the time box

Third: Hit the “Calculate” Button.

The answer will appear underneath as the soonest day and time when that person could conceivably pass an EtG type of alcohol test. (assuming they did not drink any alcohol in the meantime).

Quick EtG Calculator

This person is at high risk to fail an EtG test until at least:


EtG tests are more sensitive to the presence of alcohol than traditional tests, but this sensitivity also introduces variables that can affect the reliability of the results. Factors such as the individual’s metabolism, age, gender, health condition, and even the type of alcohol consumed can influence the levels of EtG metabolites. Additionally, the use of products containing alcohol, such as mouthwash or hand sanitizers, can sometimes lead to false positives in EtG tests, highlighting the need for careful interpretation of results.

To mitigate these variables, cutoff levels have been established to distinguish between incidental exposure to alcohol (from products containing alcohol) and actual drinking. However, the interpretation of EtG test results requires a nuanced understanding of these factors. Medical history, timing of the test relative to the alleged time of drinking, and an individual’s body composition all play critical roles in accurately assessing EtG test outcomes.

EtG alcohol tests offer a valuable tool for detecting alcohol consumption over an extended period, far beyond the capabilities of standard alcohol screenings. Despite their advantages, the interpretation of EtG tests must account for a variety of variables to avoid false positives and accurately reflect an individual’s alcohol consumption history. This complexity makes EtG tests a powerful, yet nuanced instrument in the arsenal of alcohol monitoring and detection strategies.

Good Luck!

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