Turn this list into pipeline.
Diagnostics Companies in London: 74 Active Firms (2026)
Diagnostics companies in London provide laboratory testing, pathology analysis and screening services for healthcare providers and patients.
Buying centres tend to sit with clinical operations, pathology leads, private clinic groups, occupational-health teams and research sponsors rather than general corporate IT. The work is mostly B2B or health-system-facing, with engagements shaped by turnaround times, sample logistics, clinical governance and reporting obligations. London operators in this segment typically sell recurring testing capacity, specialist interpretation or screening support, with contract scope driven by volume, modality and whether the customer needs laboratory processing, imaging interpretation, biopsy support or employer-facing screening workflows.
Read more
London has 74 actively trading diagnostics firms in this list, making it a small, specialist cohort within healthcare services rather than a broad life-sciences population. Three companies report turnover above £5M, so the revenue base is concentrated in a limited number of higher-turnover operators, while 5 firms were incorporated since 2022. Employment is visible across the cohort, with 659 reported staff, reflecting the need for scientific, clinical, quality, logistics and operational roles even among relatively focused testing and reporting businesses.
Medical laboratory accreditation sits alongside CQC registration for diagnostic and screening procedures. UKAS accreditation is commonly used for medical laboratories, while the CQC scope covers imaging, sample-taking, sample examination, biopsies, reporting and some physiological measurement; remote reporting operators can fall within registration requirements in their own right. Where assays or devices are placed on the Great Britain market, MHRA registration and UK responsible-person arrangements matter for non-UK manufacturers. The practical result is a market structure split between service operators, clinical reporting functions and IVD-linked suppliers, with quality systems and traceability built into delivery.
Scale-up scarcity appears likely to persist, partly because diagnostics businesses need clinical governance, accredited processes and dependable logistics before volume becomes attractive. Newer entrants tend to cluster around specialist assays, remote reporting, employer screening and clinic-facing services, where the addressable customer is clearer and capital requirements can be contained. Consolidation may come from providers looking to add capacity or reduce referral leakage, but procurement pressure and regulatory overhead make this a slower market than many software-led healthcare categories.
74
Active firms
2026
3
Over £5M
reported revenue
5
Since 2022
new incorporations
Key facts
About 4% of the trading cohort reports turnover above £5M (3 of 74 firms) — the rest sits below that revenue band.
6% of the cohort was incorporated since 2022 (5 firms), so a sizeable share is in its first few filing cycles.
The UK diagnostic “wholesale” market was estimated at £9.3 billion in 2025, up from £8.5 billion in 2021, with £8.4 billion generated from NHS-funded services and £946 million from private hospitals and clinics.
NHS patient pathology test volumes reached c.780 million tests/profiles by 2024, with a further c.8 million for private-pay patients.
Medical laboratories commonly use ISO 15189 accreditation, while CQC registration can apply to diagnostic and screening procedures including imaging, sample analysis, biopsies and some physiological measurement.
IVD medical devices must be registered with the MHRA before being placed on the Great Britain market, with UK responsible-person rules for non-UK manufacturers.
International comparisons in 2025 put UK diagnostic intensity below peers: 50% fewer MRI scans and 40% fewer CT scans per capita than the US, Germany or France, and around half the level of radiologists per capita.
Top London diagnostics companies
CELLULAR PATHOLOGY SERVICES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides diagnostic histopathology and cytopathology laboratory services for healthcare providers, including tissue processing, staining, immunohistochemistry, molecular diagnostics, frozen sections,…
Serves NHS organisations and private healthcare providers, including hospitals, clinics and specialist clinical teams needing outsourced cellular pathology support for patient diagnostics, backlog…
Financial Health
StrongStrong · Hiring · 9% CAGR over 2y
Location
Vital Radiology Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides teleradiology services delivering remote interpretation and reporting of medical imaging, including MRI, CT scans, X‑rays, mammography and dental CT. Offers routine, out‑of‑hours and…
Serves NHS Trusts and other healthcare providers requiring outsourced radiology reporting, including hospitals and clinical teams handling emergency, routine and subspecialty imaging cases.
Financial Health
DistressedDistressed · -7% CAGR over 4y
Location
Diagnostic360 Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides medical diagnostic laboratory testing services for healthcare providers and corporate clients, including specimen collection, laboratory analysis, and rapid turnaround reporting of results,…
Serves healthcare providers and corporate clients across London and within a 50-mile radius requiring diagnostic laboratory services.
Financial Health
StableStable · Hiring · 31% CAGR over 2y
Location
SPECIALIST HISTOPATHOLOGY SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides independent histopathology laboratory services, delivering consultant diagnostic reporting on biopsies and surgical specimens. Offers pathology analysis, second‑opinion reviews, and research…
Serves medical professionals, private practices and hospitals needing consultant histopathology support, plus patients seeking expert second opinions on pathology diagnoses across multiple clinical…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
DMC Imaging Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides teleradiology reporting services for healthcare providers, including remote interpretation of CT, MRI and X‑ray imaging studies, backlog reporting, and clinical audit support, using…
Serves radiology managers and service leads in NHS trusts and private hospital groups needing external reporting support, including CT, MRI and X-ray workloads.
Financial Health
StableStable · Hiring · 23% CAGR over 4y
Location
The HLH Imaging Group Limited
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides teleradiology services for healthcare providers, including specialist radiology reporting for lung cancer screening, cardiac imaging and prostate MRI. Integrates AI‑enabled imaging systems…
Sells to UK healthcare providers, especially NHS organisations and screening programmes, needing subspecialist teleradiology, cardiac imaging and prostate MRI reporting. Also serves radiologists and…
Financial Health
StrongStrong · Growing, Hiring · 78% CAGR over 4y
Location
HEXARAD GROUP LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides teleradiology services and software for radiology departments, including remote diagnostic image reporting by specialist radiologists and a radiology business intelligence platform (OptiRad)…
Sells primarily to NHS radiology departments and hospital trusts needing teleradiology and workflow tools, and also to radiologists seeking reporting work through its platform.
Financial Health
StrongStrong · Growing, Hiring · 82% CAGR over 4y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides teleradiology services and software for radiology departments. Offers remote diagnostic image reporting by specialist radiologists, AI‑supported workflows, and business intelligence tools…
Serves NHS trusts and healthcare radiology departments needing additional reporting capacity, workflow intelligence and departmental efficiency tools, as well as radiologists seeking reporting work.
Financial Health
StrongStrong
Location
Kernel Diagnostic Laboratories Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides laboratory diagnostic testing services, including blood testing and clinical test profiles in areas such as biochemistry, endocrinology and blood grouping, supporting healthcare providers…
Serves healthcare providers, doctors, clinics and businesses across the UK, from small clinics to national providers needing routine screening, high-volume blood testing or specialised diagnostic…
Financial Health
WeakWeak · -7% CAGR over 3y
Location
SURGIMED HEALTHCARE LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides diagnostic ultrasound imaging services for patients referred by healthcare providers, including abdominal, pelvic, musculoskeletal, Doppler and breast scans, delivered by trained staff using…
Serves NHS patients requiring diagnostic ultrasound and healthcare referrers arranging scans, with clinics in London and a care-closer-to-home model.
Financial Health
WeakWeak · Hiring · 67% CAGR over 5y
Location
Fairford Medical Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides diagnostic imaging capacity to healthcare providers, operating a fleet of MRI and CT scanners supplied to NHS trusts and hospitals to support medical imaging and diagnostic services.
Serves NHS trusts and other UK healthcare providers that need additional diagnostic imaging capacity, with services ultimately used by patients referred for MRI and CT scans.
Financial Health
DistressedDistressed · 0% CAGR over 1y
Location
SAH DIAGNOSTICS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides diagnostic and clinical support services to NHS trusts and healthcare providers, including mobile and insourced diagnostic facilities, equipment and staff. Delivers procedures in…
Sells to NHS Trusts, hospitals, ICBs and other UK healthcare partners needing extra diagnostic and treatment capacity. Targets public-sector healthcare organisations managing cancer backlogs, patient…
Financial Health
HealthyHealthy · Hiring · 153% CAGR over 4y
Location
Harley Fitzrovia Health Limited
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides private GP consultations, specialist medical consultations and diagnostic services including MRI, CT and ultrasound scans. Offers medical tests, imaging reports, fertility services and…
Serves self-paying and insured private patients and families, plus NHS/public-sector healthcare partners, needing outpatient consultations and diagnostic imaging in London and across the UK.
Financial Health
WeakWeak · 12% CAGR over 2y
Location
THE IMAGING CLINIC LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides diagnostic imaging services and radiology reporting, including MRI, CT and other medical scans interpreted by consultant radiologists. Offers image‑guided treatments and interventional…
Serves private healthcare patients and referring clinicians seeking consultant radiologist oversight, particularly for oncology, paediatric and musculoskeletal cases.
Financial Health
DistressedDistressed · -90% CAGR over 2y
Location
TRINITY MEDICAL IMAGING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides diagnostic imaging services including digital X‑ray and ultrasound examinations. Operates a clinic offering scheduled and limited walk‑in imaging tests, with radiology reporting and online…
Serves a mix of patients and healthcare referrers, including physicians, hospitals and clinics arranging X-ray and ultrasound appointments.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
NEUROPHYS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides neurophysiology diagnostic testing and intraoperative neuromonitoring services for hospitals and surgeons, including EEG, evoked potentials, thermal threshold testing, and nerve monitoring…
Serves hospital consultants, surgeons and clinical referrers, along with referred patients from local and surrounding hospitals needing neurophysiology testing or surgical monitoring support.
Financial Health
HealthyHealthy · Hiring · 32% CAGR over 2y
Location
Echelon Health Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides private preventative health assessments including full-body screening, MRI and CT imaging, cardiovascular and cancer checks, and medical tests. Services include personalised health…
Serves private individuals seeking preventative health screening, particularly adults concerned about cancer, heart disease, dementia or under-40 health, alongside employers arranging corporate…
Financial Health
HealthyHealthy · Hiring · 24% CAGR over 4y
Location
TIC DIAGNOSTICS LTD
Trajectory
3y · 2022–NowProvides private diagnostic and healthcare services including MRI, CT, X-ray and ultrasound imaging, cardiac screening and monitoring, GP consultations, blood testing, physiotherapy, osteopathy,…
Serves UK private patients, employers needing occupational health screening, and individuals requiring travel, insurance, cast, DVLA or TfL medical assessments.
Financial Health
Insufficient historyInsufficient history
Location
MEDSERENA UPRIGHT MRI LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides private diagnostic imaging services specialising in open and upright MRI scans. Offers scans of brain, spine, joints and other body areas using weight‑bearing and positional imaging, with…
Serves private self-pay and insured patients, NHS and overseas patients, plus healthcare professionals making referrals, particularly people with claustrophobia, mobility, weight, back or joint…
Financial Health
HealthyHealthy · Hiring · 21% CAGR over 4y
Location
Devonshire Diagnostic Centre
Operates a private medical diagnostic centre providing imaging and diagnostic tests including CT, MRI and ultrasound scans, alongside specialist consultations and health screening services within the…
Sells to private patients seeking healthcare, including self-pay, insured and international patients, as well as employers and healthcare professionals. Serves adults, women, children and maternity…
Location
Independent Physiological Diagnostics Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides sleep and neurological diagnostic testing services, including home and clinic-based sleep studies, electroencephalography (EEG), spirometry and FeNO lung function tests, and sleep therapy…
Serves UK private patients seeking sleep, neurological and respiratory assessments, plus clinicians and healthcare organisations needing referral pathways for diagnostic testing and therapy support.
Financial Health
HealthyHealthy · Hiring · 73% CAGR over 4y
Location
REGENERUS LABORATORIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides functional and diagnostic laboratory testing for healthcare practitioners, including blood, urine and stool tests assessing biomarkers, hormones, gut health and metabolic markers, alongside…
Serves healthcare practitioners delivering personalised care and their patients seeking answers to unresolved health issues, with additional onboarding for students entering functional medicine.
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
ULTRASOUND SCANNING SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides private diagnostic ultrasound scanning and blood testing services, including pregnancy dating and 3D/4D scans, pelvic and abdominal imaging, musculoskeletal, kidney, bladder and…
Serves private self-referring patients in London seeking pregnancy, fertility and diagnostic ultrasound appointments, plus NHS patients through a CCG contract.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
Trajectory
1y · 2025–NowProvides remote, doctor-led health screening services for employers. Supplies at-home test kits and diagnostics for conditions such as metabolic syndrome, cancer and diabetes, with result analysis,…
Sells to UK employers, particularly HR, health and safety, and occupational health teams, across sectors such as infrastructure, hospitality and technology that manage workforce wellbeing, sickness…
Financial Health
Insufficient historyInsufficient history
Location
Southern Ultrasound Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides vascular ultrasound services under contract to an NHS foundation trust, supplying specialist sonographers and clinical vascular scientists to perform diagnostic vascular imaging and…
Serves NHS healthcare organisations, specifically Frimley Health NHS Foundation Trust, and the trust’s inpatient and outpatient populations across its sites.
Financial Health
HealthyHealthy · -3% CAGR over 4y
Location
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides pharmacy‑based phlebotomy and diagnostic testing services. Operates a network of partner pharmacies where patients can book blood draws, with support for test kit distribution, sample…
Serves healthcare providers needing blood-testing logistics, pharmacies offering local diagnostic services, and individuals accessing health checks, blood tests and weight-loss support through…
Financial Health
DistressedDistressed · -6% CAGR over 2y
Location
TIC MOBILE LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides mobile and relocatable medical imaging units including MRI, CT and mammography trailers for hospitals and clinics. Offers equipment rental, deployment and maintenance support, with optional…
Serves private and public hospitals, NHS screening programmes and veterinary practices needing mobile or relocatable diagnostic imaging capacity, with optional staffing, across the UK, Ireland and…
Financial Health
HealthyHealthy
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsOperates private healthcare clinics providing GP appointments, diagnostic imaging including MRI, CT and X‑ray, and specialist services such as cardiology, dermatology, gastroenterology,…
Serves self-paying private healthcare patients and employers purchasing corporate health and wellbeing services. Targets individuals needing private GP, specialist, diagnostic and health check…
Financial Health
StableStable
Location
LONDON VASCULAR SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides ultrasound vascular imaging and diagnostic scans to assess blood vessels and circulation, including examinations for conditions such as deep vein thrombosis, arterial disease, aneurysms and…
Serves private patients and healthcare referrers seeking vascular ultrasound scans, particularly people needing diagnostic imaging for vascular conditions. Targets individuals rather than business…
Financial Health
StableStable · Hiring · 6% CAGR over 4y
Location
DMC Health LLP
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides healthcare services to NHS partners, delivering community and outpatient clinics in dermatology, gastroenterology and endoscopy, ENT, audiology and gynaecology, and offering radiology…
Serves NHS commissioners, trusts, providers and health organisations needing outsourced clinical capacity and pathway support across community, outpatient and secondary care, with patients as end…
Financial Health
StableStable · 0% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides private diagnostic imaging services including MRI scans, runs continuing professional development (CPD) courses for allied health professionals, and operates a platform introducing patients…
Serves private healthcare patients and medical referrers, plus allied health professionals seeking CPD and people looking for introductions to healthcare practitioners in London.
Financial Health
StableStable · Hiring · 4% CAGR over 3y
Location
Thrive Health Hubs Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides private healthcare services including diagnostic imaging such as MRI, CT, X‑ray and ultrasound, musculoskeletal physiotherapy, joint injections, rheumatology and pain clinics, and specialist…
Serves private healthcare patients and service users seeking clinic-based diagnostic, musculoskeletal, rheumatology, pain, ADHD and other specialist care, including people managing ongoing health…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 4y
Location
Harley Street Sports Enterprises Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsOperates a private medical clinic providing specialist consultations, diagnostics and day surgery. Services include breast screening and imaging, dermatology, hernia repair, gynaecology,…
Serves private healthcare patients seeking specialist consultations and procedures, particularly for breast, prostate, skin, hernia, gynaecology, rheumatology and imaging needs, alongside GPs and…
Financial Health
DistressedDistressed
Location
Clinical Diagnostic Services London Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides diagnostic ultrasound imaging and screening services focused on gynaecology, fertility, pregnancy and breast health. Offers prenatal scans, non‑invasive prenatal testing, pelvic and ovarian…
Serves private healthcare patients, primarily women and couples seeking pregnancy, gynaecology, fertility, miscarriage and prenatal care, with additional general health, breast and male screening for…
Financial Health
WeakWeak · -3% CAGR over 4y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsOperates a private medical clinic providing specialist consultations, diagnostics and day surgery. Services include breast screening and imaging, dermatology, hernia repair, gynaecology,…
Sells to private patients seeking specialist medical care, including women’s and men’s health, breast, prostate, dermatology, hernia and imaging services. Also serves referring doctors and GPs…
Financial Health
WeakWeak · -2% CAGR over 5y
Location
Provides fertility diagnostics and treatments including IVF, ICSI and intrauterine insemination. Offers fertility testing, semen analysis, ovulation induction, donor egg and sperm programmes, and…
Serves B2C fertility patients, including individuals and couples seeking IVF and related treatment, single women, same-sex patients, transgender patients, and donors. Also serves NHS-funded and…
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsOperates private ultrasound clinics offering pregnancy and women’s health scans, including 2D and 4D baby scans, early pregnancy and gender scans, plus pregnancy and fertility blood tests and…
Serves B2C customers, mainly expectant parents and pregnant women seeking private pregnancy scans and related blood tests, plus women needing ultrasound or fertility testing at clinics in Orpington…
Financial Health
HealthyHealthy · Hiring · 24% CAGR over 4y
Location
Inomed Neurocare Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides intraoperative neurophysiological monitoring (IOM) services for surgical procedures, supplying neuromonitoring specialists, medical devices and accessories used to monitor nervous system…
Serves NHS and private hospital surgical teams, including neurosurgeons, spinal, vascular and brain surgery departments, and healthcare providers needing specialist intraoperative neurophysiology…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 4y
Location
Specialist Cardiac Diagnostics Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mobile cardiac diagnostic testing including echocardiography and heart screening delivered in patients’ homes, community clinics, workplaces and sports clubs. Accepts GP referrals and works…
Serves private patients needing cardiac tests at home, GP-referred patients, sports clubs, businesses running community screening projects, and NHS organisations including ICBs seeking community…
Financial Health
HealthyHealthy · Hiring · 73% CAGR over 4y
Location
MDX Healthcare Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides pharmacy-based healthcare services including COVID‑19 PCR and antigen testing, travel and fit‑to‑fly certificates, postal testing kits, and testing programmes for individuals, families, care…
Serves consumers and families, especially travellers, alongside care homes, corporate clients and hotel partners seeking pharmacy-related healthcare support in the UK.
Financial Health
StableStable · Hiring · 11% CAGR over 4y
Location
Harley Street Imaging Group Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides private diagnostic ultrasound imaging and screening services, including pregnancy scans, breast and pelvic assessments, abdominal and vascular scans, and musculoskeletal imaging, with…
Sells directly to private patients, including women, men, pregnant individuals and children, seeking diagnostic and screening ultrasound scans, especially those wanting self-pay, no-referral and…
Financial Health
StrongStrong · Growing, Hiring · 34% CAGR over 4y
Location
Grosvenor Gardens Holdings Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates private medical clinics providing women’s health and paediatric services, including gynaecology and obstetrics consultations, antenatal and postnatal care, pregnancy ultrasound scans,…
Serves self-pay, insured and international private patients in Central and South London, mainly women seeking gynaecology or maternity care, expectant parents needing pregnancy scans, and families…
Financial Health
StableStable · Hiring · 18% CAGR over 2y
Location
MEDIHEALTH HUB LTD
Trajectory
1y · 2025–NowProvides healthcare services including doctor consultations, laboratory diagnostics, pharmacy dispensing, nutrition advice, wellness screenings, and home‑based medical care. Also supplies healthcare…
Targets a mixed B2C and B2B market: individual patients, families and home-care patients, as well as corporate employers seeking staff health support and outpatient clinics needing laboratory…
Financial Health
Insufficient historyInsufficient history
Location
REFUAH DIAGNOSTICS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides private healthcare services including GP consultations, minor injury treatment, specialist clinics, and diagnostic services such as X‑ray, ultrasound, blood tests and ECGs, along with home…
Serves self-paying private patients and families in North London, including adults, children and people seeking outpatient appointments; also accepts patient referrals from clinicians.
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
Operates private hospitals, clinics and diagnostic centres providing elective surgery, medical treatments and diagnostic imaging. Services include orthopaedics, cardiology, cancer care, cosmetic…
Serves self-pay and insured private healthcare patients across the UK, alongside employers seeking occupational health support and healthcare professionals using hospital facilities.
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsOperates a private medical clinic providing urgent care and GP consultations, diagnostic imaging including MRI, X‑ray and ultrasound, and services such as orthopaedics, cardiology, lab testing,…
Serves private self-pay and insured patients in London, including adults, children, older patients, sports injury cases and international travellers seeking walk-in or same-day private healthcare.
Financial Health
StrongStrong · Hiring · 37% CAGR over 4y
Location
OPTIMALLYME LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides home blood testing kits that allow individuals to collect samples at home and receive laboratory analysis and digital reports on biomarkers, supporting monitoring of nutrition, hormones and…
Sells to health-conscious consumers seeking personalised health insights through at-home testing.
Financial Health
StableStable · Hiring · 448% CAGR over 1y
Location
Operates private hospitals, outpatient and medical centres providing specialist consultations, diagnostics, imaging, surgery and treatments across areas including cancer care, cardiology,…
Serves private healthcare patients, including insured, self-pay and international patients, across adult, women’s, maternity and paediatric care, plus businesses and healthcare professionals seeking…
Location
Cardiac Screen Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cardiac testing and heart screening services, including ECG, stress ECG, echocardiograms, ambulatory ECG and blood pressure monitoring, and blood tests. Offers screening packages, ultrasound…
Serves private patients seeking cardiac and medical screening, including athletes, taxi, bus and lorry drivers, pilots, international patients, and embassy-referred patients.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
Unlock all 74 leads
Showing 49 of 74 — +25 more with verified decision-maker contacts, live data, and CRM sync.
How London diagnostics companies work and how to sell to them
What they do
Revenue usually comes from priced testing capacity, clinical interpretation, screening programmes and related sample-handling services. Operators may charge per test, per report, per pathway, by retainer for reserved capacity, or through project fees for research and employer screening. Work often combines physical operations with clinical workflow software: specimen collection, courier coordination, laboratory processing, quality review, reporting and escalation to the referring clinician. Margins depend less on licence economics than utilisation, reagent and staffing costs, repeatable protocols and turnaround-time discipline. Higher-value engagements tend to involve specialist modalities, biopsy support, complex interpretation or assured capacity, where the buyer is paying for governed throughput rather than a generic lab slot.
Who they sell to
Customers are usually private clinic groups, hospital departments, research sponsors, occupational-health providers and, in some cases, public-sector buyers. Decision-makers tend to include pathology leads, clinical directors, operations managers, procurement teams, finance leads and governance or quality officers; IT may be involved when portals, integrations or remote reporting are part of the workflow. Small clinic relationships can be direct and referral-led, with pricing agreed around menu, turnaround time and service-level expectations. Larger contracts are more likely to require tendering, due-diligence packs, information-governance checks, accreditation evidence and clinical oversight sign-off, so sales cycles are slower and more dependent on documentation than on product demos.
What they buy
Most diagnostics firms tend to spend on laboratory information management, sample tracking, electronic requesting and reporting, secure messaging, quality management, document control, incident handling and audit preparation. They also buy courier and cold-chain logistics, clinical waste services, insurance, regulatory advice, accounting, payroll, recruitment and specialist training. Where remote reporting or clinic portals are used, needs extend into identity access, cybersecurity, uptime monitoring, data integration and patient communications. Sellers of marketing or revenue tooling should expect a narrower fit: demand is usually tied to referral growth, private clinic acquisition, employer screening contracts or research sponsor relationships, rather than high-volume consumer acquisition.
Why and how to sell to them
Buying triggers tend to appear when a diagnostics provider adds a modality, opens a collection route, wins referral volume, prepares for accreditation work, changes clinical leadership or moves from manual reporting into portal-based delivery. Pain points are usually operational: samples arriving with incomplete details, turnaround-time pressure, result amendments, stock control, rota gaps, slow invoicing, data protection reviews and evidence gathering for audits. Outbound works better when it links to these frictions in the buyer's language. A credible approach references governed throughput, traceability, reduced rework, faster handoffs and clearer proof for procurement or inspectors, rather than broad claims about efficiency.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
Also in London
Related directories
Frequently asked questions
How many diagnostics companies are there in the London?↓
What counts as a diagnostics company in this list?↓
Which are the largest diagnostics companies in the London?↓
What do diagnostics companies in the London actually do?↓
How does London diagnostics compare internationally?↓
How is this list built and how fresh is the data?↓
How big are the typical diagnostics companies in the London?↓
Are these mostly new or established diagnostics companies?↓
What SIC codes does this use?↓
What buying signals should I look for?↓
Push these 74 companies into your pipeline.
Find the right decision-makers, see verified company data, and export your list in seconds.