Private blood testing at 76 Wimpole Street
CDT Blood Test in London
Assess alcohol consumption over approximately the previous two to three weeks.
Receive secure, doctor-reviewed results within five working days.
Book Your CDT Test Check whether CDT suits you
Assessment window
Approximately 2–3 weeks
Results
Within 5 working days
Attendance
Walk-in after confirmation
What Is a CDT Blood Test?
CDT means carbohydrate-deficient transferrin, a naturally occurring blood protein.
Its level may rise following sustained, heavy alcohol consumption.
CDT provides a longer assessment window than standard alcohol testing.
Who Is This CDT Test For?
DVLA Medical Preparation
Check your CDT level before an official DVLA medical.
Personal Monitoring
Review recent alcohol patterns using an objective blood marker.
Workplace Requirements
Suitable when an organisation specifically requests CDT testing.
Legal Requirements
May support requests needing documented alcohol-marker results.
Always confirm the required test with the requesting organisation.
What Does the CDT Result Mean?
The laboratory measures CDT as a percentage of total transferrin.
CDT is normally present, so results are not expected to be zero.
A higher result may indicate sustained, heavy alcohol consumption.
Individual health factors may influence interpretation. Your report receives doctor review.
Which Alcohol Test Do You Need?
Choose the test matching the required assessment period.
| Test |
Typical period |
Sample |
Common purpose |
| CDT |
Approximately 2–3 weeks |
Blood |
Sustained heavy drinking and DVLA preparation |
| PEth |
Approximately 3–4 weeks |
Blood |
Alcohol consumption over recent weeks |
| Urine EtG |
Often around 24–72 hours |
Urine |
Recent alcohol exposure |
| Alcohol profile |
Several assessment periods |
Blood |
Broader alcohol and liver assessment |
Assessment periods vary with consumption, health and sample timing.
How Your London CDT Test Works
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Order online. Enter each client’s details securely within your cart.
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Await confirmation. We send attendance instructions by text and email.
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Attend Patient Reception. Bring your original passport or driving licence.
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Provide your blood sample. A trained phlebotomist completes collection.
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Receive your result. We email the doctor-reviewed report securely.
Attend Patient Reception in Central London
Address
The Doctors Laboratory
76 Wimpole Street
London W1G 9RT
Opening Hours
Monday–Friday: 7am–7pm
Saturday: 7am–1pm
Sunday: 8am–11am
Attendance
Walk in during opening hours after receiving confirmation.
Bring original photo identification. Phone images and photocopies are unacceptable.
Results and Turnaround
Results are usually available within five working days.
Laboratory processing begins after your blood sample arrives.
Every report receives doctor review before secure email delivery.
Book early when working towards a medical or legal deadline.
Why Choose Drug Test London?
Central London Testing
Attend conveniently at 76 Wimpole Street.
Accredited Laboratory
Testing uses UKAS-accredited The Doctors Laboratory.
Doctor-Reviewed Reports
A doctor reviews each report before release.
Established Service
We have streamlined private testing since 2015.
CDT Blood Test Questions
What does a CDT blood test show?
It measures carbohydrate-deficient transferrin, a marker linked with sustained heavy drinking.
How far back does CDT assess alcohol use?
CDT commonly reflects approximately the previous two to three weeks.
Is this an official DVLA medical test?
No. It privately checks your CDT level before an official assessment.
Can CDT detect one recent drink?
CDT assesses sustained consumption, rather than one isolated recent drink.
Do I need an appointment?
No. Walk in after receiving your attendance confirmation.
Do I need photo identification?
Yes. Bring an original passport or driving licence.
Can I take the CDT test at home?
Yes. Choose the home CDT finger-prick test.
Where can I learn more about CDT?
Read our detailed CDT blood testing guide.
Book Your CDT Blood Test Today
Order online and receive your London attendance confirmation.
Book Your CDT Test
