The Carbohydrate-Deficient Transferrin (CDT) Test is a reliable blood test used to detect chronic and excessive alcohol consumption. Because it checks alcohol use over the previous 2-3 weeks, it is more useful than blood or urine alcohol tests that only check for alcohol use over the previous 1-2 days. The CDT test measures the level of the CDT protein that rises with prolonged alcohol misuse. It is ideal for people about to have a DVLA medical so that they can go into it with confidence knowing their result. It is also used for personal, legal, or workplace purposes. Results are available within 5 working days*, ensuring prompt and confidential reporting.
The CDT Test is designed for individuals and organisations requiring alcohol misuse detection:
With a focus on accuracy and discretion, this test ensures reliable insights into long-term alcohol use.
The CDT Test detects excessive alcohol consumption typically over the past 2–3 weeks. Elevated CDT levels indicate chronic heavy drinking, providing a clear indicator of misuse. Please note that the CDT protein is normally found in the body so its value can never be zero. It's level rises in response to increased alcohol consumption.
> Read more about CDT Blood Testing
To ensure compliance and traceability, you must provide valid photo ID (e.g., passport or driving licence) during your appointment. This ensures results meet legal and professional standards.
Please note that copies of IDs or those shown on mobile phones are not accepted.
Results are processed within 5 working days* and securely delivered via Email. In our experience, it's important to have your CDT test well before your DVLA medical to avoid undue anxiety. All results are supervised by a doctor before being issued.
Please note that results cannot be given over the phone as the identity of the caller cannot be verified.
*Note: Turnaround time may vary slightly depending on sample collection time.
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  Often combined with a liver function blood test to check for any damage to the liver from excessive alcohol consumption.
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1. Please enter the name(s) and date of birth(s) of the person(s) taking the test at the top of the page. These details are essential to uniquely identify your sample by the laboratory and you will be unable to proceed further without them.Â
2. Pay online by credit or debit card.
3. Initially, you will receive an automatic reply to confirm that we have received your instructions.
4. Your test request will then be processed between 9am-5pm, Monday-Friday. Once processed, you will receive a text message and email to confirm that you can now attend Patient Reception to have the test. Please wait for this confirmation before making your way to Patient Reception, otherwise they will be unaware that you will be attending.
5. You can attend Patient Reception at any time during opening hours of 7am-7pm, Monday-Friday, and 7am-1pm on Saturday. It is closed on Sundays and Public Holidays. The only exception is for Chain of Custody tests as these need an appointment.
7. Make sure to bring an original photo ID such as a passport or driving license. A copy or phone image is not acceptable.
8. Results will be sent by email as soon as they are available.
All laboratories need information regarding the client to identify their individual sample.
Tests cannot be done without these details.
The minimum requirement is the full name and date of birth.
You can enter these details securely above. Personal details are subject to GDPR according to our Privacy Policy. Alternatively, you can email these to us at: enquiry@drugtest.london
All laboratory tests need a photo ID to be shown at Patient Reception at the time of the test.
This is to ensure that it is the client who is taking the test.
Drug and alcohol test results often need to be shown to courts or other agencies and must be valid.
Only a valid passport or driving license is accepted.
Originals must be shown. No copies or images on a phone.
All results are strictly confidential and cannot be shared with any third party without the client's permission.
Most negative results are available within 2 working days.
All tests are processed by UKAS accredited The Doctors Laboratory.
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Unfortunately not. Payment should be made online before you attend for your test through our secure platform. We've tried to make this as easy as online shopping.
Only the Chain of Custody Test needs an appointment. All other tests can be done any time during Patient Reception opening hours on a walk-in basis once the test has been paid for online.
Patient Reception Opening Hours:
Negative drug tests can be reported after 1-2 days depending on demand. It is rare to get results the same day. Check the Product Description for results timings. Results are sent by email.
The Doctors Laboratory
76 Wimpole Street,
London. W1G 9RT.
Mon-Fri: 7AM-7PM
Sat: 7AM-1PM
Sun: Closed
Drug Test London has been in business since 2015 streamlining the process of drug and alcohol testing for individuals, solicitors, social workers and companies.
Call us at 0207 871 3015 or email us at enquiry@drugtest.london
All our tests are performed at UKAS accredited The Doctors Laboratory.
Drug Test London is a brand of AIS Health Ltd, Company Number 09835294.
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