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Dr Karen Breen

Verified Haematology London

Dr Karen Breen

7 years of experience 5.0 (2 verified reviews)

6,103+
Patients seen
7
Years in practice
15
Publications
1
Languages spoken

PROFILE SUMMARY

About Dr Karen Breen at a glance

Dr Karen Breen is a Haematology practitioner based in London, United Kingdom, practising at Universidad de Sevilla Teaching Hospital. They have 25+ years of clinical experience. Procedures focus on gp consultation, annual physical exam, vaccination administration, minor procedure (skin). Educated at Universidad de Sevilla (MD, 2015). Serves patients in London, United Kingdom and the surrounding area.

About

Dr Karen Breen is a Consultant Haematologist with a specialist interest in thrombosis. She completed her undergraduate training at Trinity College Dublin, followed by postgraduate and specialist haematology training in Ireland, before moving to the UK to undertake research leading to an MD.
She is a member of both the Royal College of Physicians of Ireland and the Royal College of Pathologists (UK). Dr Breen is actively involved in clinical trials and translational research in antiphospholipid syndrome and has authored and co-authored numerous publications on thromboembolic disease. She regularly lectures at national and international conferences and plays a leading role in the acute management of thrombosis and anticoagulation as part of the Trust Thromboprophylaxis and Thrombosis Committee at Guy’s and St Thomas’ NHS Foundation Trust.
Her main clinical interests are in the management of thrombotic and bleeding disorders, including deep vein thrombosis, pulmonary embolism, and anticoagulation management with both traditional and newer direct oral anticoagulants. She also has extensive expertise in peri-operative management of clotting and bleeding disorders, including during pregnancy, as well as in the investigation and treatment of abnormal blood counts such as anaemia and thrombocytopenia.

“Evidence-based care tailored to each patient — taking the time to explain options and shared decisions.”

— Dr Karen Breen

Education & training

  1. 2009–2015 MD · Medicine and Surgery
    Universidad de Sevilla, London (GB)
  2. 2015–2019 Residency · Haematology
    Universidad de Navarra, London (GB)

Career & appointments

  1. 2019-09–2020-08 Junior consultant
    Universidad de Sevilla Teaching Hospital — Haematology

Licenses & insurance

Medical licenses

GB — Organización Médica Colegial de España (OMC)
#GB-379008 active · expires 2028-12-31

Board certifications

European Board of Haematology
#EB-6BD4EF02 · issued 2020 · renewal 2030
Malpractice insurance: HDI Global · 4,000,000 EUR coverage · No claims on file

Procedures performed

ProcedureCodeLifetime count
GP consultation 99213 957
Annual physical exam 99395 1,715
Vaccination administration 90471 1,091
Minor procedure (skin) 17110 2,764

Services & pricing

ServiceDurationModalityPrice
New patient consultation (60m) 60 min in_clinic|telemed 180.00 EUR
Follow-up consultation (30m) 30 min in_clinic|telemed|phone 90.00 EUR
Vaccination administration 90 min in_clinic 720.00 EUR
Minor procedure (skin) 60 min in_clinic 630.00 EUR

Office, team & in practice

Karen Breen
HEADSHOT
Karen Breen in consultation
IN OFFICE
Karen Breen with the team
WITH TEAM
Karen Breen at a conference
CONFERENCE

Videos

introduction · 60s
Meet Karen Breen

Research & publications

h-index: 6 · i10: 13

  1. Validation of clinical scoring in Haematology
    Karen Breen, et al. · European Journal of Medicine, 2026
    DOI: 10.7340/euroclin.2026.0 · PMID: 37232540 · cited by 69
  2. Long-term follow-up of Haematology across GB
    Karen Breen, et al. · European Journal of Medicine, 2025
    DOI: 10.7766/euroclin.2025.1 · PMID: 36510610 · cited by 119
  3. Validation of clinical scoring in Haematology
    Karen Breen, et al. · European Journal of Medicine, 2024
    DOI: 10.1050/euroclin.2024.2 · PMID: 34026873 · cited by 129
  4. Long-term follow-up of Haematology across GB
    Karen Breen, et al. · European Journal of Medicine, 2023
    DOI: 10.4399/euroclin.2023.3 · PMID: 34200238 · cited by 187

Invited talks

  • Practical updates in Haematology European Annual Congress (Haematology) · Vienna · 2024 · invited
  • Single-centre experience in Haematology National Society Meeting · London · 2023 · oral abstract

Awards & memberships

Awards

  • 🏆 Top-rated Haematology — London · EuroClinics Patient Choice · 2025 · regional
  • 🏆 Excellence in Patient Care · National Society · 2024 · national
  • 🏆 Young Investigator Award · European Society · 2023 · international

Society memberships

  • WONCA Europe — Family Doctors — Member · Since 2020
  • national college of family doctors — Member · Since 2020
  • European Union of Medical Specialists (UEMS) — Member · Since 2020

Articles by this doctor

  • Patient education Patient guide to Haematology
  • Awareness When should you see a haematology?

For international patients

Coordinator
Patient liaison · dr.karen.breen@euroclinics.example
Accepted international insurance
Allianz Worldwide · AXA Global · BUPA Global · Cigna Global

Location

1 tag

Patient reviews

2 verified reviews
5.00
★★★★★
2 reviews
5★ 2
4★ 1
3★ 0
2★ 0
1★ 0
Bedside Manner
5.0
Knowledge
5.0
Wait Time
4.8
Staff Friendliness
5.0
Ease Of Appointment
4.9
Value For Money
4.9
Would Recommend Pct
99.0
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Recent reviews

  • ★★★★★ ✓ Verified
    Very thorough first visit — explained every step. Booking was easy and the staff were welcoming.
    Anna B.
  • ★★★★★ ✓ Verified
    Took time to listen and reviewed all my previous results. I would absolutely recommend.
    Marco V.
  • ★★★★☆ ✓ Verified
    Professional and knowledgeable. Wait on the day was a bit long, otherwise excellent.
    Helena F.

SPECIALTIES & PROCEDURES

Dr Karen Breen's Areas of Specialty

Each specialty below reflects the conditions and procedures Dr Karen Breen treats, with the size of the national pool of United Kingdom doctors offering the same care.

Haematology

Dr Karen Breen is one of 297 haematology doctors indexed in United Kingdom. Browse haematology doctors in United Kingdom →

LOCAL CARE CONTEXT

Why local healthcare in London matters

Medical practice in United Kingdom is governed by country-specific licensing, professional standards, and patient-safety regulations. Practitioners listed here are registered with the relevant United Kingdom medical authority and operate within national rules on scope of practice, prescribing rights, and continuing professional development. Care delivered in London carries the additional benefits of local language support, in-person follow-up, and direct coordination with regional hospitals and labs. A verified profile means EuroClinics has cross-checked the practitioner or clinic against an official source (national medical register, public licence database, or the practitioner themselves), and that the data shown here matches that source as of the last verification date above.

Looking for additional providers? all doctors in London or all doctors in United Kingdom.

Frequently asked questions

Quick answers to the questions patients ask most. The same answers are surfaced to AI assistants via structured data.

  • What does Karen Breen specialise in?

    Karen Breen specialises in Haematology in London, GB. 25 years of clinical experience.

  • What conditions does Karen Breen treat?

    Karen Breen treats conditions within Haematology. View the full conditions-treated list on the profile.

  • Where does Karen Breen practise?

    Karen Breen practises in London, GB. The profile page lists all practice addresses, phone numbers, and clinic affiliations.

  • What languages does Karen Breen speak?

    Karen Breen speaks English.

  • How do I book an appointment with Karen Breen?

    Use the "Request a booking" button on the profile to send an appointment request. Most appointments are confirmed within 24 hours; many slots are bookable instantly.

  • What do patients say about Karen Breen?

    Karen Breen has a verified rating of 5/5 from 2 patient reviews. Read the most recent reviews on the profile page.

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