CDT and PEth Alcohol Testing Explained
In family law proceedings involving concerns about alcohol use, courts may consider medical testing to obtain evidence. Two tests sometimes used in parenting matters are CDT testing and PEth testing.
These tests can provide insight into alcohol consumption patterns and may assist courts when allegations of alcohol misuse arise.
You can learn more about how substance use is assessed in parenting cases in our guide to Drug and Alcohol Issues in Parenting Proceedings.
What Is CDT Testing?
CDT stands for Carbohydrate Deficient Transferrin.
It is a blood test that measures a biomarker associated with heavy alcohol consumption over time.
Elevated CDT levels may indicate sustained or chronic alcohol intake over a period of weeks.
This test is sometimes used where concerns exist about long-term alcohol misuse rather than occasional drinking.
What Is PEth Testing?
PEth (Phosphatidylethanol) is another blood test used to detect alcohol consumption.
PEth forms in the bloodstream only when alcohol is consumed, making it a highly specific indicator of alcohol intake.
The test may detect alcohol consumption over the previous two to four weeks, depending on the level and frequency of drinking.
Why Courts May Use These Tests
CDT and PEth testing may be considered in parenting proceedings where:
• Alcohol misuse is alleged
• There is a history of alcohol dependency
• Concerns exist about relapse
• Other evidence suggests ongoing alcohol consumption
Testing can provide independent medical evidence that may assist the court in assessing parenting risk.
How Test Results Are Used
Results from CDT or PEth testing are generally considered alongside other evidence, including:
• Medical records
• Witness and Affidavit evidence
• Police reports
The court will assess whether any alcohol consumption affects the safety, wellbeing, or stability of the child.
Disclaimer: This article provides general information only and should not be relied upon as legal advice. Every family law matter is unique and requires specific legal guidance. Always seek professional legal advice for your specific situation.
