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Sarah Ondrejka, DO

Sarah Ondrejka, DO
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Department Laboratory Medicine
Primary Location Cleveland Clinic Main Campus
Type of Doctor Adults Only
Languages English
Surgeon No
Cleveland Clinic Main Campus
Primary Location

Cleveland Clinic Main Campus

Specialties & Treatments

Specialty in Diseases & Conditions

  • Castleman's Disease
  • Juvenile Myelomonocytic Leukemia
  • Rare Cancer and Blood Disease Program
  • TAFRO Syndrome
View all 4 Specialties +


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About Sarah Ondrejka, DO

Sarah Ondrejka, DO, is a Staff Physician in the Pathology and Laboratory Medicine Institute at Cleveland Clinic.  She graduated from the Ohio University Heritage College of Osteopathic Medicine in Athens, Ohio.  She completed residency in Anatomic and Clinical Pathology at Cleveland Clinic (Cleveland, Ohio) and a two-year fellowship in Hematopathology at Cleveland Clinic, and has been in practice in the department of Laboratory Medicine since 2014.  Dr. Ondrejka serves as the Medical Director of Flow Cytometry.

Dr. Ondrejka specializes in diagnostic interpretation of bone marrow aspirates and biopsies, peripheral blood smears, body fluids, lymph node biopsies, flow cytometry, hemostasis and thrombosis tests, and other laboratory hematology tests.  Her interests include Hodgkin and non-Hodgkin lymphomas, diseases of the bone marrow, and analysis of hemoglobinopathies and thalassemias.  She is passionate about applying up-to-date practices in hematopathology to achieve a helpful and concise diagnosis that may impact patient experience and outcome. 

She is board certified in Anatomic and Clinical Pathology and Hematology.  She is a fellow of the College of American Pathologists and the American Society for Clinical Pathology, and is a member of the United States and Canadian Academy of Pathology, the Society for Hematology, the American Society of Hematology, and the International Society for Laboratory Hematology.

Education & Professional Highlights

Education & Professional Highlights


Education & Fellowships

Fellowship - Cleveland Clinic
Clinical Pathology
Cleveland, OH USA

Fellowship - Cleveland Clinic
Cleveland, OH USA

Residency - Cleveland Clinic
Anatomic and Clinical Pathology
Cleveland, OH USA

Medical Education - Ohio University College of Osteopathic Medicine
Athens, OH USA

Undergraduate - Miami University
Oxford, OH USA


  • Pathology - Hematology
  • Pathology - Anatomic & Clinical Pathology
Research & Publications

Research & Publications

See publications for Sarah Ondrejka, DO.

(Disclaimer: This search is powered by PubMed, a service of the U.S. National Library of Medicine. PubMed is a third-party website with no affiliation with Cleveland Clinic.)

Industry Relationships

Industry Relationships

Cleveland Clinic physicians and scientists may collaborate with the pharmaceutical or medical device industries to help develop medical breakthroughs or provide medical expertise or education. Cleveland Clinic strives to make scientific advances that will benefit patient care and support outside relationships that promise public benefit. In order for the discoveries of Cleveland Clinic physicians' and scientists' laboratories and investigations to benefit the public, these discoveries must be commercialized in partnership with industry. As experts in their fields, Cleveland Clinic physicians and scientists are often sought after by industry to consult, provide expertise and education.

To assure professional and commercial integrity in such matters, Cleveland Clinic maintains a program that reviews these collaborations and, when appropriate, puts measures in place to minimize bias that may result from ties to industry. Cleveland Clinic publicly discloses the names of companies when (i) its physicians/scientists receive $5,000 or more per year (or, in rare cases, equity or stock options) for speaking and consulting, (ii) its physicians/scientists serve as a fiduciary, (iii) its physicians/scientists receive or have the right to receive royalties or (iv) its physicians/ scientists hold any equity interest for the physician's/scientist's role as inventor, discoverer, developer, founder or consultant.* In publicly disclosing this information, Cleveland Clinic tries to provide information as accurately as possible about its physicians' and scientists' connections with industry.

As of 7/3/2023, Dr. Ondrejka has reported no financial relationship with industry that is applicable to this listing. In general, patients should feel free to contact their doctor about any of the relationships and how the relationships are overseen by Cleveland Clinic. To learn more about Cleveland Clinic's policies on collaborations with industry and innovation management, go to our Integrity in Innovation page.

Public Health Service-Reportable Financial Conflicts of Interest. Cleveland Clinic scientists and physicians engage in basic, translational and clinical research activities, working to solve health problems, enhance patient care and improve quality of life for patients. Interactions with industry are essential to bringing the researchers' discoveries to the public, but can present the potential for conflicts of interest related to their research activities. Click here to view a listing of instances where Cleveland Clinic has identified a Public Health Service (PHS)-Reportable Financial Conflict of Interest and has put measures in place to ensure that, to the extent possible, the design, conduct and reporting of the research is free from bias.

* Cleveland Clinic physicians and scientists subscribe to the guidance presented in the PhRMA Code on Interactions with Healthcare Professionals and the AdvaMed Code of Ethics on Interactions with Health Care Professionals. As such, gifts of substantial value are generally prohibited.

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