CDT Blood Test

Carbohydrate Deficient Transferrin Blood Test

  • Carbohydrate Deficient Transferrin (CDT) is a biomarker for heavy alcohol consumption.
  • Used by the DVLA in its fitness-to-drive test for high-risk offenders.
Call Us NowBook Today

What is Carbohydrate-deficient transferrin (CDT)?

Carbohydrate-deficient transferrin, known as “CDT,” is a blood test to detect excessive alcohol consumption (five or more drinks of alcohol per day) over the past two weeks. This test is an objective way to screen and monitor clients.

This test is useful for those who are about to undertake the DVLA medical prior to the return of their licence following conviction and they want to make sure that they will pass. A CDT blood test can also be used as proof that they have ceased or reduced their alcohol consumption.

CDT blood tests are a measurement of a particularly sensitive biomarker. The test can track heavy alcohol consumption over an extended period of time. If an individual drinks regularly, then the percentage of transferrin, which is deficient in carbohydrates will rise. The longer the person drinks, then the higher the level of Carbohydrate Deficient Transferrin. Transferrin remains in the circulatory system for 7 to 14 days and CDT, therefore, can give an indication of alcohol consumption over this period of time. This test gives it an advantage over blood or urine alcohol measurements which only remain elevated for 24-48 hours after alcohol consumption. Elevated CDT levels will reduce in line with the quantity of alcohol consumed.

Intermittent or binge drinking can also increase the level of CDT. The extent to which this occurs is dependent on the frequency of consumption and the amount of alcohol consumed on each occasion.

Carbohydrate Deficient Transferrin levels will then revert to normal after several weeks of abstinence.

This test 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. CBT testing also forms part of the DVLA medical following a Drink Drive conviction.

The CDT blood test is used by the DVLA in its fitness-to-drive test for high risk offenders. The test is very specific and is not affected by other drugs or substances.

Contact Our Blood Test Team

Premium Affordable Healthcare

Summerfield Healthcare private medical centres are conveniently located & always administer an outstanding standard of patient care.

“Being a self-employed tutor means I can’t wait to see a Doctor.

Thankfully with Summerfield Healthcare I was able to see a Doctor swiftly.

I used to think that private healthcare was for the privileged few. Now it’s essential for the self-employed.

Pippa Cox

Language Tutor, Lingweenies

Shrewsbury

  • Building 1, Charlesworth Ct.
  • Hotspur Park, Knights Way
  • Battlefield, Shrewsbury
  • SY1 3FB

Wolverhampton

  • Summerfield Healthcare
  • 8 Summerfield Road
  • Wolverhampton
  • WV1 4PR

Contact Summerfield Healthcare

Summerfield Healthcare is regulated by the CQC.

Our bookings team are available between 8.00am-6.00pm Monday to Friday and 9.00am-3.00pm Saturdays.

To find out more please call us on 0333 9000 010, email enquiries@summerfieldhealthcare.co.uk or use our contact form.

Preferred Centre: