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Carbohydrate Deficient Transferrin - CDT

Carbohydrate Deficient Transferrin (CDT) is a biomarker for heavy alcohol consumption and is used by the DVLA in its fitness-to-drive test for high risk offenders.

The Carbohydrate Deficient Transferrin (CDT) test is a particularly sensitive biomarker that tracks heavy alcohol consumption over an extended period of time. If an individual drinks steadily and heavily (4-6 units of alcohol per day) for several weeks the percentage of transferrin which is deficient in carbohydrate will rise. The longer a person drinks at this level, the higher the level of CDT. Intermittent or binge drinking can also increase CDT levels. The extent to which this occurs is dependent on the frequency of binges and the amount of alcohol consumed on each occasion.

Elevated CTD will decline with reduced alcohol consumption, and will revert to normal after several weeks of abstinence.

This test has a very high level of specitivity (i.e. it is not affected by other drugs or substances) and therefore it has been adopted by the Secretary of State's Honorary Medical Advisory Panel as the sole test for assessing harmful use of alcohol for high risk offenders. 


Who is this blood test for

This test is for people who wish to prove that they have moderated or ceased their alcohol consumption. It is used by motorists who have been deemed high risk offenders to gain peace of mind before they take a CDT test as part of the DVLA medical examination to get their driving license back.

Because this test is used to measure the effects of heavy alcohol intake, symptoms of alcohol use can vary dramatically. However, some of the signs that you're drinking too much can include diabetes, alcohol poisoning, cancer, aggression and reduced chances of conceiving.

What's included

We will send you your Carbohydrate Deficient Transferrin - CDT finger-prick blood and test sample collection kit which contains everything you need to take your blood and sample in the comfort of your own home. If you are unsure about completing a finger-prick blood sample collection you will have the opportunity to select a clinic-based venous blood sample collection or choose to go our London laboratory during the checkout process.

Your Carbohydrate Deficient Transferrin - CDT test includes 1st class postage and packaging for you to send your blood and sample directly to our laboratory for analysis. If you live in an area where you cannot rely on the post or you simply want to ensure that your sample arrives at the laboratory the following day, you may wish to send your blood and sample guaranteed next day delivery for extra reassurance.

Your blood and sample will be analysed at one of our chosen laboratories. You can be assured of fast, accurate results from one of our accredited independent providers of clinical diagnostic tests.
Once you have placed your order you will receive login details to where you can manage your account, track your orders and view your Carbohydrate Deficient Transferrin - CDT test results in your own personal dashboard.
Our medical team will comment on out-of-range blood and test results and give you follow-up advice where necessary. If you need it, a PDF copy of your Carbohydrate Deficient Transferrin - CDT test results can be downloaded for your doctor. Want a hard-copy report? You will be given the opportunity to order one during the checkout process.

Carbohydrate Deficient Transferrin - CDT is included in the following categories: Drug and AlcoholLiver Health