Denis M. Dwyre, M.D.

Director, Hematopathology


Denis M. Dwyre is not currently accepting new patients. For assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).



Pathology - Hematopathology

Pathology - Clinical

Pathology - Apheresis

Locations and Contact

Pathology Building

4400 V St.
Sacramento, CA 95817

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Additional Numbers

Clinic Phone


Physician Referrals

800-4-UCDAVIS (800-482-3284)

Philosophy of Care

As a pathologist and an internist, I know the importance of pathology in the daily care of patients. I appreciate the importance of careful and well-thought out diagnostic pathology reports. I practice with this thought process, and teach my approach to trainees during my daily work.

Clinical Interests

Dr. Dwyre has clinical responsibilities in hematopathology, including leukemia, lymphoma and flow cytometry, as well as apheresis (the withdrawal of blood from a donor's body, removal of one or more components, and transfusion of the remaining blood back into the donor), which includes pediatric apheresis and progenitor-cell collection. He is involved in hematology-related clinical research involving leukemia, lymphoma and apheresis.

Research/Academic Interests

Dr. Dwyre's clinical research involves leukemia, lymphoma, and apheresis; hematopathology — leukemia, lymphoma, flow cytometry; apheresis — pediatric apheresis and progenitor cell collection.



Undergraduate School

B.S., Biological Science, UC Davis, Davis CA 1985

Medical School

M.D., University of Cincinnati College of Medicine, Cincinnati OH 1994


Pathology, UC Davis Medical Center, Sacramento CA 1994-1995


Pathology, UC Davis Medical Center, Sacramento CA 1994-1998


Internal Medicine, UC Davis Medical Center, Sacramento CA 1997-2000


Hematopathology, UC Davis Medical Center, Sacramento CA 2000-2001


Transfusion Medicine, University of Iowa, Iowa City IA 2003-2005

Excellence in Dermatology, University of Cincinnati, 1994

Excellence in Gross Anatomy, University of Cincinnati, 1991

Dwyre DM, Graff JP, Rashidi HH. Importance of bone marrow clot sections-Positive for metastatic tumor. Int J Lab Hematol. 2022 Aug;44(4):696-697. doi:10.1111/ijlh.13808. Epub 2022 Feb 16. PMID:35170236.

Ladenheim A, Mitra AD, Lechpammer M, Dwyre DM. Hidden treasures: Incidental findings in two cases of chronic subdural hematoma. Surg Neurol Int. 2022 Jun 23;13:267. doi:10.25259/SNI_828_2021. PMID:35855153.

Tau J, Fernando LP, Munoz MC, Poh C, Krishnan VV, Dwyre DM. Evaluation of thrombotic thrombocytopenic purpura and other thrombotic microangiopathies: Lessons learned from a 14-year retrospective study. Ther Apher Dial. 2022 May 2. doi:10.1111/1744-9987.13864. Epub ahead of print. PMID:35501999.

Mitra A, Datta Mitra A, Patel G, Dwyre DM, Graff JP. Leukoerythroblastosis in a Sickle Cell Patient With Pregnancy: An Interesting Peripheral Blood Smear Finding. J Hematol. 2022 Feb;11(1):15-20. doi:10.14740/jh921. Epub 2021 Dec 13. PMID:35356637.

Mitra A, Dwyre DM, Schivo M, Thompson GR 3rd, Cohen SH, Ku N, Graff JP. Leukoerythroblastic reaction in a patient with COVID-19 infection. Am J Hematol. 2020 Aug;95(8):999-1000. doi:10.1002/ajh.25793. Epub 2020 Apr 6. PMID:32212392.

Gosselin RC, Honeychurch K, Kang HJ, Dwyre DM. Effect of Multiple Freeze-Thaw Cycles on Coagulation Testing. Semin Thromb Hemost. 2020 Jun;46(4):515-520. doi:10.1055/s-0040-1709474. Epub 2020 May 21. PMID:32438422.

Qorbani A, Gao G, Dwyre DM. Polyclonal CD5+/CD19+ B1a lymphocytes after allogeneic stem cell transplantation: a potential diagnostic pitfall. Autops Case Rep. 2020 May 6;10(2):e2020147. doi:10.4322/acr.2020.147. PMID:33344271.

Dwyre DM, Osman M. AML with inv(16) with numerous Charcot-Leyden crystals. Blood. 2019 Nov 21;134(21):1876. doi:10.1182/blood.2019002684. PMID:31751481.

Wei D, Jensen H, Dwyre DM. Intrauterine parvovirus B19 infection. Transfusion. 2018 May;58(5):1095-1096. doi10.1111/trf.14595. PMID:29683514.

Vali Betts E, Dwyre DM, Wang HY, Rashidi HH. PAX5-Negative Classical Hodgkin Lymphoma: A Case Report of a Rare Entity and Review of the Literature. Case Rep Hematol. 2017;2017:7531729. doi:10.1155/2017/7531729. Epub 2017 Oct 4. PMID:29109877.