Order your kit
Your test arrives in discreet packaging with clear instructions.
About this test
Measures carbohydrate-deficient transferrin (CDT), an indirect marker that may rise after sustained heavy alcohol exposure. This standard home-collection test should not be assumed to meet DVLA, court, employer or other identity and chain-of-custody requirements; confirm the required collection process before ordering for an official purpose.
At a glance
- Sample: Capillary blood in a Gold Microtainer
- Collection: Collect the blood sample at home using TDL self-collect kit KT353
- Estimated turnaround: 3 days from laboratory receipt of a usable sample
What this test measures
- Carbohydrate-deficient transferrin (CDT)
- An indirect blood marker that may rise after sustained heavy alcohol exposure. A raised result may support sustained heavy alcohol exposure, but liver conditions and other factors can affect it and one result cannot diagnose alcohol dependence.
How clinicians use this test
Clinicians use CDT as one objective marker when assessing a pattern of sustained heavy alcohol exposure. It is not a measure of current intoxication and cannot diagnose alcohol dependence without history and clinical assessment.
Is this the right test for you?
This may suit someone who specifically wants to check Carbohydrate-deficient transferrin (CDT), or repeat the marker(s) as part of an established monitoring plan. It is a focused test and may not include related markers needed to explain an abnormal result. The test should not delay assessment of persistent or worsening symptoms.
Preparation and collection
Return the sample on the same day it is collected. Do not post over weekends or bank holidays.
Understanding your result
The laboratory will report Carbohydrate-deficient transferrin (CDT) with an assay-specific reference range, threshold or qualitative interpretation. Read the biomarker explanation above for common reasons a result may be high, low, detected or reactive, then use the laboratory comment and clinical context to decide whether repeat or follow-up testing is needed.
Your results and next steps
Review Carbohydrate-deficient transferrin (CDT) against the reference range and laboratory comment, then consider whether the pattern fits your symptoms, medicines and reason for testing. Share a concerning or unexpected result with a clinician before changing treatment, supplements or diet.
Limitations
The result is a snapshot from one sample. It cannot diagnose a condition on its own; values inside or outside a reference range require clinical context.
When to get medical help
Do not wait for a home-test result if you feel seriously unwell. Call 999 for a life-threatening emergency, or use NHS 111 when you need urgent advice and are unsure what to do.
Who this test is for
- People who want a clearer view of the concern described above
- Anyone comfortable using the stated sample-collection method
- People who want doctor-reviewed results and practical next-step guidance
How it works
Collect your sample
Follow the kit guidance for the sample type shown above.
Post the same day
Post Monday–Thursday using the supplied tracked return.
Get your results
View secure, doctor-reviewed results and clear guidance online.
How to prepare
- Read the instructions before collecting your sample
- Check whether timing, fasting or medication guidance applies
- Collect and post on the same day wherever possible
Understanding your results
Clear ranges and doctor guidance
Your secure report shows the measured values, reference ranges and a doctor’s comment where appropriate.
Questions, answered
How accurate is an at-home test?
Your sample is processed by a professional UK partner laboratory using the same analytical methods used for clinician-requested testing. Sample quality depends on following the collection instructions carefully.
Are my results private?
Yes. Kits use discreet packaging and your results are delivered through a secure digital service.
Does this diagnose a condition?
No. The test checks and measures biomarkers. Results and the doctor’s comment can help you decide what to discuss with your GP.
When should I post my sample?
Collect and post on the same day, ideally Monday–Thursday, to avoid a sample waiting in the postal system over a weekend.
What happens if my sample cannot be processed?
The support team will explain the next step if the laboratory cannot process your sample. Any recollection or refund depends on the circumstances and the applicable policy.
When should I speak to my GP?
Speak to your GP if symptoms persist, worsen or concern you. Seek urgent medical help for severe or sudden symptoms.
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