The Doctors Laboratory

What The Doctors Laboratory does

The Doctors Laboratory (TDL) is a medically-led diagnostic pathology laboratory headquartered at The Halo Building, 1 Mabledon Place, London, founded in 1987 and operating as part of Sonic Healthcare UK. TDL provides accredited clinical pathology testing services across 23 specialty areas including clinical biochemistry, haematology, immunology, microbiology, genetics, molecular diagnostics (PCR), histopathology, cytology, virology, allergy, andrology, cervical screening, endocrinology, occupational health, reproductive health, sexual health, tumour markers, and vitamins and nutrition. Its testing infrastructure underpins UKAS-accredited COVID-19 RT-PCR testing (number 8059 via HSL Analytics LLP within the Sonic Healthcare group) and includes differentiated offerings such as the Stockholm3 prostate cancer test and the Ziwig Endotest saliva-based endometriosis test.

TDL sells through two parallel go-to-market motions. The B2B motion targets NHS hospitals, private hospitals, GP practices, and clinical specialists via direct sales relationships, with clinician-facing workflow tools including TDL eViewPlus for electronic result reporting, the annual TDL Laboratory Guide, online booking for TDL Collect and andrology services, and bundled diagnostic profiles. The direct-to-consumer motion targets private patients through 76 Wimpole Street patient reception (open 7am-7pm weekdays plus weekend hours), home visits, TDL Postal Pathology for remote sample submission, and TDL Self-Collect Kits. Pricing is quote-based, billed per test or profile to providers and patients, with separate NHS and private-sector pricing structures; no public price list is disclosed.

The Doctors Laboratory Limited is a private limited company registered in England and Wales (company number 02201998) with 251-500 employees. Revenue, funding, ownership structure, and management team composition are not publicly disclosed in the available data. The company operates an annual publication cadence (Laboratory Guide 2026 most recent), maintains UK registered trademarks across the TDL, TDL Genetics, TDL Tinies, and TDL Tiny brands, and serves customers across the UK and internationally through its Sonic Healthcare group affiliation.

Name

The Doctors Laboratory

Legal name

The Doctors Laboratory Limited

Website

https://tdlpathology.com

Company type

Private

Founded year

1987

Operating status

Operating

Headcount range

251–500 employees

Short description

The Doctors Laboratory is a UKAS-accredited, medically-led diagnostic pathology laboratory in London providing testing across 23 specialties to NHS hospitals, private hospitals, GP practices, clinical specialists, and direct private patients via reception, home visits, postal pathology, and self-collect kits, operating within the Sonic Healthcare UK group.

Ownership category

akta.pro rank

Product category

Diagnostic Pathology Services

NAICS

Medical Laboratories (621511), Medical and Diagnostic Laboratories (6215), Medical and Diagnostic Laboratories (62151)

SIC

Services-Medical Laboratories (8071)

akta.pro primary industry

Reference & Esoteric Testing Laboratories (HLAFAMAJ)

akta.pro secondary industries

Remote Diagnostics & Point-of-Care (Connected Testing, Home Lab Devices) (HLACAPAK), Toxicology & Therapeutic Drug Monitoring Laboratories (HLAFAMAF)

Keywords

• Diagnostic pathology services
• Clinical laboratory testing
• Genetic testing
• Medical diagnostics
• Histopathology services

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Technology or R&D

Revenue model

1. Clinical Pathology Testing Services: Laboratory diagnostic testing services billed to healthcare providers, NHS, private hospitals, clinics, and direct patients. Revenue generated per test or profile ordered.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels2 records

Core offering

The Doctors Laboratory (TDL) is a UK-based independent pathology and clinical laboratory provider that delivers diagnostic testing across a broad range of medical specialties for healthcare clinicians, GP practices and private patients. It offers sample collection, laboratory analysis and results reporting through both provider-facing and patient-facing channels.

Product overview

The Doctors Laboratory is a medically-led diagnostic pathology laboratory providing quality accredited pathology services. The company operates a unified service model centered on its core testing portfolio organized across 21 specialty areas including Allergy, Andrology, Biochemistry, Genetics, Haematology, Histopathology, Immunology, Microbiology, and Virology. TDL's patient-facing services include Self-Collect Kits for home sampling, TDL Postal Pathology for remote testing, and patient reception facilities. Clinicians access results through the TDL eViewPlus online portal and can book appointments via TDL Collect Online Booking or Andrology Online Booking. The company also offers clinical trial services through TDL Trials. Supporting resources include the TDL Test List (comprehensive A-Z test directory), TDL Profiles (bundled test panels), and the annual TDL Laboratory Guide publication.

Differentiator

Problem solved

Functional benefit

Brands

• TDL GENETICS: Genetics division of The Doctors Laboratory providing genetic testing services.
• TDL TINIES
• TDL TINY

Products and services

• TDL eViewPlus An online results portal enabling healthcare clinicians to view and manage patient pathology test results digitally.
• TDL Collect An online booking and sample collection service allowing patients and clinicians to arrange appointments for specimen collection.
• Self-Collect Kits Home testing kits enabling patients to collect their own samples for pathology testing without visiting a clinic.
• TDL Postal Pathology A postal service through which patients send collected samples to the laboratory for pathology analysis.
• Home Visits In-home sample collection service where clinical staff visit private patients to collect specimens for testing.
• TDL Trials Clinical trial laboratory services supporting research organizations with pathology testing for clinical studies.

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Two partnerships are on record, tiered core.

• HSL Analytics LLPcoreTechnology or IntegrationCOVID-19 RT-PCR testing undertaken by TDL group laboratories under UKAS number 8059 (HSL Analytics LLP), indicating a closely integrated testing partnership within the Sonic Healthcare group.
• Sonic Healthcare UKcoreOthersTDL is part of Sonic Healthcare UK, referencing Sonic Healthcare UK Tax Strategy on corporate pages. Sonic Healthcare is a global medical diagnostics company.

Scale indicators2 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Synlab: Synlab is Europe's largest medical diagnostics services provider, offering clinical laboratory testing across routine and specialty disciplines to hospitals, clinicians, and patients. It is the most direct comparison to TDL in terms of business model, test menu breadth, and pan-European private pathology footprint.
• Unilabs: Unilabs is a major European clinical diagnostics and pathology laboratory operator serving hospitals, clinicians, and private patients across multiple countries. Its mix of routine and specialty clinical testing directly mirrors TDL's service portfolio and B2B/B2C go-to-market.
• Health Services Laboratories (HSL): HSL is a London-based pathology partnership (including HSL Analytics LLP, which holds UKAS No. 8059 referenced by TDL) providing clinical diagnostics to NHS and private hospitals. It is a direct UK pathology peer and a partner referenced in TDL's COVID-19 testing operations.
• Medicover: Medicover operates clinical laboratories and diagnostic services across Central and Eastern Europe alongside its healthcare facilities, offering routine and specialty testing to clinicians and patients. Comparable to TDL in combining laboratory services with healthcare delivery channels.

Broad incumbents

• Sonic Healthcare: Sonic Healthcare is TDL's parent group and one of the world's largest medical diagnostics companies, operating pathology laboratories across Australia, Europe, and the US. It is the broadest incumbent comparable for TDL's specialty, scale, and global operating model.
• Quest Diagnostics: Quest Diagnostics is one of the largest US-based clinical laboratory networks offering routine, esoteric, and anatomic pathology services to physicians, hospitals, and consumers. Comparable to TDL in the breadth of its test menu, clinician-led B2B model, and growing consumer diagnostics channel.
• Laboratory Corporation of America (Labcorp): Labcorp is a global clinical laboratory and diagnostics giant offering routine, specialty, and clinical trial lab services to providers, biopharma, and consumers. Comparable to TDL across clinical diagnostics, clinical trials (TDL Trials analog), and direct-to-consumer testing.

Others

• Nuffield Health: Nuffield Health is a UK charity operating private hospitals and wellbeing services that include in-house pathology and diagnostic testing. It overlaps with TDL as a UK private healthcare provider delivering diagnostic services to clinicians and patients.
• Spire Healthcare: Spire Healthcare is a major UK private hospital group with on-site pathology and diagnostic services used by its consultants and referred patients. It represents an adjacent UK healthcare operator with overlapping diagnostic testing needs to those TDL serves.
• The London Clinic: The London Clinic is a London-based private hospital offering diagnostic services to consultants and private patients. As a London-located private healthcare provider with on-site diagnostics, it is an adjacent peer within TDL's primary operating geography.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about The Doctors Laboratory