Results
Usually 5 working days
Attendance
Walk-in after confirmation
What Is a Blood Drug Test?
This laboratory test screens blood for seven drug classes.
Blood testing usually assesses more recent use than urine testing.
Each result uses a defined laboratory cut-off.
A doctor reviews the result before secure email delivery.
Which Drugs Does the Blood Test Screen?
The panel screens these seven drug classes.
| Drug class |
Laboratory cut-off |
| Amphetamines |
20 µg/L |
| Barbiturates |
100 µg/L |
| Benzodiazepines |
20 µg/L |
| Cannabinoids |
10 µg/L |
| Cocaine |
10 µg/L |
| Opiates |
10 µg/L |
| Tricyclic antidepressants |
300 µg/L |
The panel does not screen every possible drug or medicine.
Who Is This Blood Drug Test For?
Recent Drug Testing
Assess recent use across seven common drug classes.
Personal Testing
Obtain confidential laboratory testing with secure reporting.
Workplace Requirements
Suitable when an organisation specifically requests blood testing.
Legal Requirements
May suit requests accepting standard documented laboratory testing.
Confirm the sample, panel and reporting standard before ordering.
Blood Drug Test Detection Window
Blood testing generally detects more recent drug use.
Every drug has a different detection period.
Dose, frequency, metabolism and collection timing affect detection.
Compare drug detection times in blood and urine.
Should You Choose Blood or Urine Testing?
Choose the sample matching the required evidence.
| Test |
Typical focus |
Common purpose |
| Blood drug test |
More recent use |
Seven-class laboratory blood screening |
| Urine drug test |
Generally longer detection |
Routine personal or workplace screening |
| Chain-of-custody urine test |
Documented urine testing |
Formal legal, court or visa evidence |
Always follow the requesting organisation’s exact requirements.
What Does the Result Mean?
The laboratory compares findings against the stated cut-off.
Detection supports exposure to a tested drug class.
It does not prove impairment when blood was collected.
Professional interpretation may be necessary for important decisions.
What the Result Cannot Show
It cannot determine the exact consumption time.
It cannot calculate the amount taken.
It cannot exclude drugs outside this seven-class panel.
A negative result cannot exclude earlier drug use.
How Your London Blood Drug Test Works
-
Order online. Enter the client’s details securely within your cart.
-
Await confirmation. We send attendance instructions by text and email.
-
Attend Patient Reception. Bring your original passport or driving licence.
-
Provide your blood sample. A trained professional collects venous blood.
-
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 receiving your blood sample.
A doctor reviews results before secure email delivery.
Turnaround times remain indicative and can occasionally vary.
Why Choose Drug Test London?
Seven Drug Classes
One panel covers seven commonly requested drug classes.
Accredited Laboratory
Testing uses UKAS-accredited The Doctors Laboratory.
Doctor Review
A doctor reviews reports before secure delivery.
Established Service
We have streamlined private testing since 2015.
Blood Drug Test Questions
Which drugs does this blood test screen?
It screens seven drug classes listed within the table above.
How long are drugs detectable in blood?
Detection varies by drug, dose, frequency, metabolism and collection time.
Is blood testing better than urine testing?
Blood generally assesses recent use. Urine usually offers longer detection.
Is this a chain-of-custody test?
No. Confirm formal evidence requirements before ordering this standard test.
Can prescribed medicines affect the result?
Some medicines may be relevant. Provide accurate medication information when requested.
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.
When will my results arrive?
Results are usually available within five working days.
