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.


Dr. Green is a recognized expert in the diagnosis and treatment of Nutritional deficiency diseases and disorders.


Dr. Green 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


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

Green R.  Peripheral neuropathy risk and a transcobalamin polymorphism: connecting the dots between excessive folate intake and disease susceptibility.  Am J Clin Nutr. 2016 Nov 16;104(6):1495-6.

Allen L, Brito A, Verdugo R, Hertrampf E, Miller J, Green R, Fedosov S, Ferdows S, Sanchez H, Albala C, Uauy R. Vitamin B-12 treatment of asymptomatic deficient elderly. Chileans improves conductivity in myelinated peripheral nerves, but high serum folate impairs B-12 status response assessed by the combined indicator cB-12. 2016 Jan;103(1):250-7.

Green R, Dwyre DM. Evaluation of Macrocytic Anemias. Semin Hematol. 2015 Oct;52(4):279-86. Epub 2015 Jun 30. Review. 

Nathanielsz PW, Yan J, Green R, Nijland M, Miller JW, Wu G, McDonald TJ, Caudill MA. Maternal obesity disrupts the methionine cycle in baboon pregnancy. Physiol Rep. 2015 Nov;3(11).


Frazier DT, Bettcher BM, Dutt S, Patel N, Mungas D, Miller J, Green R, Kramer JH. Relationship between Insulin-Resistance Processing Speed and Specific Executive Function Profiles in Neurologically Intact Older Adults. J Int Neuropsychol Soc. 2015 Sep;21(8):622-8. Epub 2015 Aug 14.


Green R, Wachsmann-Hoigu S: Automated hematology analyzers: state of the art.  In: Kratz A, Brugnara C, Eds. Clin Lab Med. 2015 Mar;35(1):xiii-xiv. Epub 2014 Nov 28.

Chen M, Krishnamurthy A, Mohamed AR, Green R. Hematological disorders following gastric bypass surgery: emerging concepts of the interplay between nutritional deficiency and inflammation. Biomed Res Int. 2013;2013:205467. Epub 2013 Jul 25. Review.


Green R: Cobalamin supplements for infants: a shot in the cradle? Am J Clin Nutr. 2013 Nov;98(5):1149-50. Epub 2013 Sep 25.


Green R. Vitamin B12: Physiology, Dietary Sources, and Requirements. In: Caballero B. (ed.) Encyclopedia of Human Nutrition, third edition, Volume 4, pp. 351-356. Waltham, MA: Academic Press. 2013.

Green R: Nutritional Anemia. Laboratory Hematology Practice. Chapter 45, 1st ed. 2012, p 586-601.