CDT F.A.Q.s – Drug Test London

What is a CDT Test?

A CDT (Carbohydrate-Deficient Transferrin) test measures alcohol misuse markers in your blood. Elevated levels can indicate prolonged excessive alcohol consumption.

Why do I need a CDT Test?

You may need a CDT test to prepare for a DVLA medical after a drink-driving ban, ensure you meet fitness-to-drive standards, or confirm reduced alcohol intake over time.

How is a CDT Test performed?

The CDT test involves drawing a small blood sample. A laboratory then analyses the sample to detect changes in transferrin protein due to heavy alcohol use.

How long does it take to receive CDT Test results?

At Drug Test London, we aim to get results back to you within 5 working days.

Collection list

Alcohol Tests

Alcohol Tests

Alcohol Tests

Drug Tests

Urine container

Drug Tests

Postal Tests

Home test kit package

Postal Tests

Chain of Custody Drug Tests

Urine specimen containers with client details and a chain of custody form

Chain of Custody Drug Tests

Patient Reception

76 Wimpole Street, London.

W1G 9RT.

Monday-Friday: 7AM - 7PM

Saturday: 7AM - 1PM

Sunday: Closed

Since 2015, we’ve provided confidential drug and alcohol testing across London.

We support individuals, employers, solicitors, social workers and other organisations.

Order online, then attend our Central London Patient Reception after confirmation. Selected home-testing options are also available.

Samples are analysed by UKAS-accredited laboratories, including The Doctors Laboratory. Results are reviewed and sent securely by email.

Need help choosing the correct test?

Call 0207 871 3015 or email enquiry@drugtest.london.

Drug Test London is a brand of AIS Health Ltd. Company number: 09835294.

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