Alcohol (CDT) Test

CDT is a specific biomarker that may become elevated after sustained alcohol consumption over a period of weeks. Unlike many other alcohol-related markers, CDT is not typically affected by a single occasion of use; rather, it reflects a pattern of consumption over time. This makes it distinct from tests that detect the immediate presence of alcohol in the body.

CDT levels typically begin to rise after approximately two to three weeks of heavy consumption and may return to baseline after approximately two to four weeks of abstinence.

This test may be relevant for:

• Individuals who wish to gain objective insight into their own alcohol consumption patterns
• People who want to monitor changes in their CDT levels over time
• Anyone who needs documentation of alcohol-related biomarker levels for personal or professional purposes

This test measures a single biomarker:

• CDT (Carbohydrate-Deficient Transferrin): measured in blood and expressed as a percentage. Elevated CDT levels may be associated with sustained alcohol consumption over a period of approximately two to four weeks. A single instance of use typically does not affect CDT levels to the same degree.

The test provides a CDT percentage value. Elevated values may suggest a pattern of sustained alcohol consumption in the preceding weeks. Values within the normal range suggest that sustained heavy consumption is less likely to have occurred during that period.

CDT levels can occasionally be influenced by factors unrelated to alcohol, such as certain medical conditions. Results should therefore be considered in context and, where appropriate, discussed with a healthcare provider.

The test requires a blood draw, performed at a certified sample point (afnamepunt) by trained personnel. The procedure is straightforward and typically takes only a few minutes.

This test may be considered when:

• Objective data on alcohol consumption patterns over a period of weeks is desired
• Someone wants to track changes in their CDT levels across multiple measurements
• Documentation of an alcohol-related biomarker is needed

The result is expressed as a CDT percentage. Values above the laboratory's reference threshold may indicate sustained alcohol consumption over the preceding two to four weeks. Values within the normal range suggest that heavy sustained consumption during that period is less likely.

Results reflect a pattern over time rather than a single event. Individual variation exists, and results should be interpreted in consultation with a healthcare provider when needed.

No specific preparation is required for the blood draw.

Results are typically available within a few working days. The report includes the CDT percentage value along with the reference range.

If you have questions about your results or would like to discuss them further, a healthcare provider can help interpret the findings in the context of your individual circumstances.