Drug Testing in London
Clear, reliable and convenient drug and alcohol testing.
Order online, attend our London Patient Reception,
or choose a self-collection postal test where available.
Order Your Drug Test Online
What is a Drug Test?
A drug test is a laboratory analysis of a biological sample.
It checks for drugs or their metabolites.
Common sample types include urine, blood, hair and saliva.
Drug testing can show recent or past drug use,
depending on the test selected.
Why Drug Testing is Done
Drug testing may be needed for personal, legal,
medical or workplace reasons.
- Pre-employment screening
- Workplace drug and alcohol policies
- Legal or court-related requirements
- Visa or immigration requirements
- Medical assessment or monitoring
- Sports and anti-doping requirements
Testing helps provide clear evidence of substance use.
It can also support safer workplaces and formal documentation.
How Much Does a Drug Test Cost?
The cost depends on the type of test required.
It also depends on the number of substances tested.
Basic screens are usually lower cost.
More comprehensive tests may cost more.
Chain of custody and specialist tests may also differ in price.
You can browse our test range online.
Each product page shows the current price.
Our prices are designed to stay competitive and convenient.
View Test Prices
Important
Walk-In and Booked Drug Tests
Most tests do not require an appointment.
They are completed on a walk-in basis at Patient Reception.
Walk-in testing is available:
Monday to Friday, 7am-7pm,
Saturday, 7am-1pm,
and Sunday, 8am-11am.
Please make payment online before attending.
This allows us to process your order correctly.
Appointments are only required for chain of custody tests.
These are available Monday to Friday, 9am-3pm.
View Chain of Custody Tests
Urine Drug Test Detection Times
Detection times vary depending on the substance.
They also depend on frequency of use,
metabolism and the sample type.
Cannabis may be detected for longer than many other drugs.
Cocaine is usually detected for a shorter period.
Read About Detection Times
Testing Samples for Tampering
Laboratory checks help confirm sample integrity.
These checks can detect dilution, adulteration or substitution.
Common tampering methods include adding water,
drinking excessive fluids, or using synthetic urine.
Attempting to alter a sample may invalidate the test.
You may need to repeat the test at your own expense.
Lab Drug Test Cut-Off Levels
Drug tests use specific cut-off levels.
These levels help reduce false positive results.
If a drug level is below the cut-off,
the result is reported as negative.
If it is above the cut-off,
the result may be reported as positive.
This means testing does not prove a true zero level.
For example, a cannabis urine test may use a 50 ng/ml cut-off.
A result below this level is reported as negative.
Our 2-Step Drug Testing Process
Step 1: Initial Screening
The first stage is usually an immunoassay screen.
If the result is negative,
the report is released as negative.
Step 2: Confirmation Testing
Positive samples undergo confirmation testing.
This checks whether the initial positive result is accurate.
Confirmation Testing
If a sample is positive on initial screening,
further confirmation testing is performed.
This is usually done using a different analytical technique,
such as GC-MS.
Confirmation testing is only performed for the drug
or drugs found positive at the first stage.
It usually takes an additional 5 working days.
Confirmation testing can show:
- Whether the result is a true positive or false positive.
- The exact substance detected.
- The amount of the substance or metabolite present.
Understanding Your Results
You do not need to interpret the result alone.
Each report includes a comments section explaining the finding.
Creatinine Level
Creatinine helps assess whether a urine sample is too dilute.
Very dilute samples may be unsuitable for reporting.
Drug Level
This section shows whether a drug was detected.
The relevant cut-off level is usually shown beside it.
Comments
The comments explain what the result means.
If drugs are detected, further details may be included.
Dilution Warning
Avoid excessive fluid intake before a urine test.
As a guide, avoid drinking more than one glass per hour.
Need a Drug or Alcohol Test?
Choose the right test online today.
You will receive clear instructions after ordering.
Browse Drug and Alcohol Tests
