Formal urine testing with documented sample handling
Chain-of-Custody Drug Test in London
This test documents sample collection, handling and transfer to the laboratory.
Appointment required. Negative results usually arrive within two working days.
Order Your Formal Test See the documented process
Panel
Thirteen substances
Appointments
Monday–Friday, 9am–3pm
Negative results
Usually two working days
Who Needs a Chain-of-Custody Drug Test?
Choose this test when formal sample traceability is required.
| Purpose |
When it may apply |
Check before booking |
| Workplace testing |
Pre-employment or workplace policy requirements |
Required panel and reporting standard |
| Legal or court matters |
Formal disputes or evidence requests |
Court or solicitor instructions |
| Visa or overseas work |
Applications requiring traceable drug testing |
Country, employer and panel requirements |
| Professional requirements |
Regulatory or occupational requests |
Identity and reporting instructions |
Arranging tests for several employees?
What Does Chain of Custody Mean?
Chain of custody creates a documented record for the specimen.
Identity
Original photo identification confirms the donor.
Collection
Collection details are recorded during the appointment.
Handling
Sample handling and transfer are documented.
Laboratory
The documented sample proceeds to laboratory testing.
Read about chain-of-custody testing
Substances and Screening Cut-Offs
The panel screens for alcohol and twelve drug groups.
| Substance |
Cut-off |
Examples |
| Alcohol |
40 mg/dL |
Alcohol |
| Amphetamines |
300 ng/mL |
Amphetamine, methamphetamine, MDMA and ephedrine |
| Barbiturates |
200 ng/mL |
Barbiturates |
| Benzodiazepines |
200 ng/mL |
Diazepam, nitrazepam, lorazepam and alprazolam |
| Cannabinoids |
50 ng/mL |
Cannabis and marijuana |
| Cocaine |
150 ng/mL |
Cocaine |
| Opiates |
300 ng/mL |
Morphine, codeine and dihydrocodeine |
| Ketamine |
100 ng/mL |
Ketamine |
| LSD |
500 pg/mL |
LSD |
| Methadone |
100 ng/mL |
Methadone |
| Methaqualone |
300 ng/mL |
Methaqualone |
| Phencyclidine |
25 ng/mL |
PCP |
| Propoxyphene |
300 ng/mL |
Propoxyphene |
A result below a cut-off does not prove complete absence.
Chain-of-Custody Testing Process
-
Confirm the requirement. Check the panel and reporting standard.
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Order online. Enter accurate donor and contact details.
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Await appointment confirmation. Do not attend before receiving instructions.
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Attend your appointment. Bring an original passport or driving licence.
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Provide the specimen. Collection and handling details are documented.
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Receive results by email. Reports are reviewed before release.
Appointments run Monday–Friday, from 9am–3pm. Payment is required online.
Detection Window
Detection varies with substance, usage, metabolism and collection timing.
Amphetamines and cocaine
Often detectable for around 1–3 days.
Cannabinoids
May remain detectable for 1–30 days.
Other drug groups
Often detectable for around 1–4 days.
Read the detailed detection-time guide
Results and Confirmation Testing
Results are reviewed and delivered securely by email.
Negative screen
Usually reported within two working days after collection.
Initial positive screen
Confirmation testing may add five working days.
Times may vary. Results cannot be issued by telephone.
Appointment Location
Address
The Doctors Laboratory
76 Wimpole Street
London W1G 9RT
Get directions
Chain-of-custody appointments
Monday–Friday: 9am–3pm
Attend only at your confirmed appointment time.
Why Choose Drug Test London?
Documented procedure
Collection, handling and transfer details support traceability.
Accredited laboratory
Samples are processed by UKAS-accredited The Doctors Laboratory.
Doctor-reviewed results
Reports are reviewed before secure release.
Established service
Private drug testing streamlined since 2015.
Chain-of-Custody Drug Test Questions
What does chain of custody mean?
It documents sample collection, handling and transfer throughout the testing process.
Do I need an appointment?
Yes. Appointments run Monday–Friday, from 9am–3pm.
Can I attend during weekend opening hours?
No. Chain-of-custody appointments are available on weekdays only.
What identification must I bring?
Bring an original passport or driving licence.
Is this suitable for workplace testing?
It may be suitable when documented collection is required. Confirm your policy first.
Is this suitable for court or visa testing?
It may be suitable. Confirm the requested panel and reporting standard first.
What follows an initial positive result?
The laboratory performs confirmation testing. Reporting may take five additional working days.
Order Your Chain-of-Custody Drug Test
Order online, then await your confirmed weekday appointment.
Order Your Test
