Ralph Green, M.D., Ph.D., F.R.C. PATH

Ralph Green, M.D., Ph.D., F.R.C. PATH



Pathology and Laboratory Medicine

Pathology - Clinical

Pathology - Hematopathology


  • Professor


To see if Ralph Green is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).

Pathology Building

4400 V St.
Sacramento, CA 95817
Driving Directions

Primary Phone:

Additional Phone Numbers

Phone: 916-734-8078
Phone: 916-734-2370
Fax: 916-734-0299
Clinic Fax: 916-734-2560
Physician Referrals: 800-4-UCDAVIS (800-482-3284)

Philosophy of Care

Dr. Green is consulted by patients and physicians on problems relating to vitamin B12 deficiency including pernicious anemia. 

Clinical Interests

Dr. Green is a recognized expert in the diagnosis of hematological disorders, with special emphasis on anemias; in the diagnosis and treatment of nutritional deficiency diseases and disorders; and is the Director of the UC Davis Diagnostics, an outreach reference laboratory that performs clinical laboratory tests.

Research/Academic Interests

Dr. Ralph Green has dedicated a major portion of his professional effort to the practice of hematology. He has served on NIH study sections and as a consultant to the World Health Organization, the Food and Drug Administration and the National Academy of Sciences, Institute of Medicine.  

He has authored or co-authored over 250 publications. Dr. Green serves on the editorial boards of several hematology journals.  

He has been a consultant for several biotechnology and biopharmaceutical companies. He has recently served as an expert consultant for the NIH Biomarkers of Nutrition for Development group and the NHLBI Working Group on the Microbiome.


Clinical Pathology


M.D., University of Witwatersrand, Johannesburg, South Africa 1964

Ph.D., Hematology/Biochemistry, University of Witwatersrand, Johannesburg, South Africa 1976

Internship: Internal Medicine, Johannesburg General Hospital, Johannesburg, South Africa 1964


Pathology, University of Witwatersrand, Johannesburg, South Africa 1970-1972


Biochemistry, St. Bartholomew�s Hospital & Medical College, London, England 1967-1969

Board Certifications

American Board of Pathology, 1995

Royal College of Pathologists (UK), 2002

Professional Memberships

American Association for Advancement in Science

American Society for Clinical Nutrition

American Society of Clinical Pathology

American Society of Hematology

College of American Pathologists

International Society for Experimental Hematology

International Society for Laboratory Hematology

Western Association of Physicians

Honors and Awards

Berend Houwen Award and lectureship of the International Society of Laboratory Hematology, 2017

Dean�s Award for Excellence in Clinical Care, 2014

Special Award from APC Program Directors for Extraordinary Service to Pathology Resident Education, 2010

American Registry of Pathologists AFIP/Calendar Binford Lecturer Washington, DC, 2006

Royal College of Pathologists, 2002

Opening of Singapore Postgraduate Medical Institute (Keynote Speaker), 1995

Select Recent Publications

Howell LP, Wahl S, Ryan J, Gandour-Edwards R, Green R. Educational and Career Development Outcomes Among Undergraduate Summer Research Interns: A Pipeline for Pathology, Laboratory Medicine, and Biomedical Science. Acad Pathol. 2019 Dec 13;6:2374289519893105.

Garrod MG, Rossow HA, Calvert CC, Miller JW, Green R, Buchholz BA, Allen LH. (14)C-Cobalamin Absorption from Endogenously Labeled Chicken Eggs Assessed in Humans Using Accelerator Mass Spectrometry. Nutrients. 2019 Sep 8;11(9). pii: E2148.

Paniz C, Lucena MR, Bertinato JF, Lourenço FR, Barros BCA, Gomes GW, Figueiredo MS, Cançado RD, Blaia-D Avila VLN, Pfeiffer CM, Fazili Z, Green R, Carvalho VM, Guerra-Shinohara EM. Daily supplementation with 5 mg of folic acid in Brazilian patients with hereditary spherocytosis. J Investig Med. 2019 May 9.  pii: jim-2019-001025. doi: 10.1136/jim-2019-001025. [Epub ahead of print] PubMed PMID: 31076457.

Bailey DN, Buja LM, Gorstein F, Gotlieb A, Green R, Kane A, Lipscomb MF, Sanfilippo F. Life After Being a Pathology Department Chair III: Reflections on the "Afterlife". Acad Pathol. 2019 Apr 29;6:2374289519846068. 

Oussalah A, Julien M, Levy J, Hajjar O, Franczak C, Stephan C, Laugel E, Wandzel M, Filhine-Tresarrieu P, Green R, Guéant JL. Global Burden Related to Nitrous Oxide Exposure in Medical and Recreational Settings: A Systematic Review and Individual Patient Data Meta-Analysis. J Clin Med. 2019 Apr 23;8(4). pii: E551.

Garrod MG, Buchholz BA, Miller JW, Haack KW, Green R, Allen LH. 'Vitamin B12 added as a fortificant to flour retains high bioavailability when baked in bread' Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2019. DOI: 10.1016/j.nimb.2018.05.042

Su RJ, Green R, Chen M. Enumeration of bone marrow plasmacytoid dendritic cells by multiparameter flow cytometry as a prognostic marker following alloeneic hematopoietic stem cell transplantation. Blood Cells Mol Dis. 2018 Mar;69:107-112.

Christine CW, Auinger P, Joslin A, Yelpaala Y, Green R; Parkinson Study Group-DATATOP Investigators. Vitamin B12 and homocysteine levels predict different outcomes in early Parkinson's disease. Mov Disord. 2018 Mar 6.

Green R. Are malignant hematology specialists adequately prepared to care for patients with benign blood disorders? HemOnc Today. 2017 November 25.

Green R, Allen LH, Bjørke-Monsen AL, Brito A, Guéant JL, Miller JW, Molloy AM, Nexo E, Stabler S, Toh BH, Ueland PM, Yajnik C. Vitamin B(12) deficiency. Nat Rev Dis Primers. 2017 Jun 29;3:17040.