Checking your own CDT and EtG during the abstinence period

Want calm clarity about where you stand during your abstinence period? A private check of your CDT and EtG at Zuivertest gives you a measured value that only you see. We notice that many people want quiet reassurance, not an exam. One thing first: this check isn't a CBR assessment and doesn't replace it.

This page explains what CDT and EtG are, what each might show, and roughly how long alcohol markers may stay elevated. The goal is self-knowledge and a good conversation with your GP, nothing more.

What are CDT and EtG?

CDT and EtG are two biomarkers that may say something about alcohol use across different time windows. The literature describes CDT as a marker that might relate to prolonged, heavy alcohol use. EtG is a breakdown product of alcohol that can reflect more recent use. Together they may give a broader picture than a single measurement.

CDT stands for carbohydrate-deficient transferrin. Some research suggests the value might rise after weeks of heavy drinking.

EtG (ethyl glucuronide) forms after your body processes alcohol. It can show up in urine and in hair, each with its own window.

Why two markers?

One marker might only tell part of the story. CDT looks at a longer period, while EtG can signal more recent use. The combination may help you and your GP read the picture more clearly.

How long do alcohol markers stay elevated?

The detection windows vary a lot by marker and by person. After prolonged heavy use, CDT might stay elevated for roughly a few weeks. EtG in urine usually has a shorter window of about a few days, while EtG in hair can span months. These are rough estimates that may vary between individuals.

The table below gives a rough idea. Treat it as guidance, not an exact result.

Many factors can influence a CDT value, such as certain liver conditions or rare transferrin variants. That's why only a doctor can interpret your result properly for you. You'll find more background in our article on proving alcohol use and in CDT too high.

Why might you test yourself privately?

A private check gives you a measured value that only you see, so you can think calmly about your situation. We notice people appreciate this because it's discreet and carries no judgement. With that value, you can have a better-prepared conversation with your GP.

A result is a snapshot. It isn't a complete verdict on your health or your journey.

Still, a value can offer something to hold on to. You'll know roughly where you stand and can talk about it openly with your care provider.

What you can do with the result

• Look at the value calmly, in your own time
• Note down questions for your GP
• Find reliable information via CDT value and driving licence
• Contact your care provider if you're unsure about alcohol use

For general information on alcohol and health, you can turn to Thuisarts.nl and the RIVM. These sources offer independent explanations that you can discuss with your GP.

Does this replace the CBR assessment?

No. A private check at Zuivertest isn't a CBR assessment and doesn't replace it. The CBR uses its own protocol and its own criteria. A private result doesn't predict or guarantee the CBR outcome. See it as self-knowledge for yourself, separate from the official procedure.

Want to know how the official process works? Read our pillar on the CBR alcohol and drug assessment procedure. For the rules around repeat offences, there's our piece on the recidiveregeling for alcohol.

A private test is meant to give you peace of mind and to support a conversation with your GP. It's explicitly not a way to prepare for the CBR assessment or to influence an outcome.

A measured value, for yourself

We notice people mainly want calm clarity. A private Alcohol (CDT) test gives you a measured CDT value that only you see. Feel free to discuss that result with your GP afterwards, so you can look together at what it means for you.

Remember that one value is a snapshot and that many factors may play a role. Only a doctor can interpret your result for you.

Sources

• Thuisarts.nl, general information on alcohol and health.
• RIVM, independent information on alcohol.
• General scientific literature describing CDT as a possible marker of prolonged heavy alcohol use.

Every test result at Zuivertest includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.