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About us

The Doctors Laboratory (TDL) is the largest UK independent provider of highly specialised pathology/clinical laboratory services to clinicians (GPs and specialists), hospitals, community health services, and their patients.

Our pathology and laboratory services  form an essential component of modern healthcare services, backed up by comprehensive quality standards accreditation across a wide range of disciplines. We provide our clients with the laboratory information and consultant advice required for the diagnosis and treatment of medical disorders.

Our flagship main laboratory in London is one of the largest pathology laboratories in Europe. It is situated in the heart of London's bioscience hub, next door to world-renowned medical institutions and hospitals such as the Francis Crick Institute, the Wellcome Trust, and University College Hospital. The Halo is a purpose-built facility featuring the latest technologies and, coupled with our many years of experience, it allows us to deliver world-class pathology and diagnostic services.

We have an additional laboratory working to the same high standards in Manchester to help us provide a comprehensive service across the whole of the UK.

TDL services include

  • Comprehensive, multidisciplinary pathology services
  • Specialist diagnostic analysis for other laboratories
  • Pathology partnerships with NHS Trusts
  • Support for CRO and pharmaceutical companies

Our parent company, Sonic Healthcare, is one of the world’s leading providers of medical diagnostic services. It employs over 36,000 people, with a turnover of approximately AU$5.54 billion per annum. It offers extensive laboratory pathology and diagnostic services to the medical community in Australia, New Zealand, South East Asia, Germany, Belgium, Switzerland, Ireland, the UK and the USA.

Sonic Healthcare and TDL both share the same goal - our pursuit of the highest quality professional practice, led by an experienced team with a deep understanding of diagnostic and clinical medicine. It is through shared objectives and core values, that we aim for our service to doctors and patients to be at the highest possible level.


As a dynamic, rapidly-expanding organisation, TDL is always looking for ambitious, well-qualified, experienced medical laboratory staff.

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Each department in the laboratory is consultant-led. 


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Contact information for Patient Reception, and for the main London (Halo) and Manchester laboratories.

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Corporate information

Our policies, terms and conditions, and corporate reports.

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Executive Board

Our activities are managed by a leadership team made up of senior managers from across the organisation. 

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Our customers

We work with healthcare providers and organisations across the UK and overseas.

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The  latest TDL Laboratory Guide, and supporting documents.

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Quality Assurance

The quality of results is of fundamental importance, and the laboratory operates to stringent technical and administrative standards.

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TDL Customer Charter

Our goal is always to provide a high level of service to our customers who request pathology services for their patients. This is a philosophy shared by all Sonic Healthcare Pathology practices. 

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TDL News

Latest corporate updates.

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Our core values

Sonic’s Core Values act as guiding principles for how we conduct ourselves as an organisation.