San Diego County

3020 Children's Way
MC 5103
San Diego, CA 92123




Rady Children's Specialists of San Diego

Medical Group / IPA


Other Languages

Hebrew, Spanish


Schneider Childrens Hospital GME


Cornell University Medical College

Board Certifications

Pediatric Endocrinology, Pediatrics




Dr. Ron Newfield is a pediatric endocrinologist at Rady Children's Hospital-San Diego and a professor of clinical pediatrics at UC San Diego School of Medicine. He is co-director of Rady Children's Center for Gender-Affirming Care.

After earning his medical degree at Technion, Institute of Technology in Haifa, Israel, he completed his residency in pediatrics at Schneider Children's Hospital of Long Island Jewish Medical Center, New Hyde Park, N.Y., and his fellowship in pediatric endocrinology at New York Hospital-Cornell Weill College.

Dr. Newfield's clinical interests are thyroid disorders and cancer, adrenal disorders and transgender youth, calcium and bone disorders, and diabetes and lipid disorders. His research interests are type 1 diabetes and prevention, type 2 diabetes, and growth disorders.

His philosophy of care is to treat children in a broad and holistic manner, and to address family and other issues that impact children's health.

Dr. Newfield enjoys teaching the residents and endocrine fellows.

When not working, he enjoys swimming, hiking, skiing and going to watch plays or musicals.


Crinecerfont, a CRF1 Receptor Antagonist, Lowers Adrenal Androgens in Adolescents With Congenital Adrenal Hyperplasia.
Newfield RS, Sarafoglou K, Fechner PY, Nokoff NJ, Auchus RJ, Vogiatzi MG, Jeha GS, Giri N, Roberts E, Sturgeon J, Chan JL, Farber RH

Extended Use of Histrelin Implant in Pediatric Patients.
Pine-Twaddell E, Newfield RS, Marinkovic M

Short-term pediatric thyroidectomy outcome: Analysis of the Pediatric Health Information System (PHIS) database.
Jiang W, Hall M, Newfield R, Berry JG

Mutational analysis using next generation sequencing in pediatric thyroid cancer reveals BRAF and fusion oncogenes are common.
Newfield RS, Jiang W, Sugganth DX, Hantash FM, Lee E, Newbury RO

Efficacy and safety of the addition of sitagliptin to treatment of youth with type 2 diabetes and inadequate glycemic control on metformin without or with insulin.
Jalaludin MY, Deeb A, Zeitler P, Garcia R, Newfield RS, Samoilova Y, Rosario CA, Shehadeh N, Saha CK, Zhang Y, Zilli M, Scherer LW, Lam RLH, Golm GT, Engel SS, Kaufman KD, Shankar RR

A randomized clinical trial of the efficacy and safety of sitagliptin as initial oral therapy in youth with type 2 diabetes.
Shankar RR, Zeitler P, Deeb A, Jalaludin MY, Garcia R, Newfield RS, Samoilova Y, Rosario CA, Shehadeh N, Saha CK, Zhang Y, Zilli M, Scherer LW, Lam RLH, Golm GT, Engel SS, Kaufman KD

Subcutaneous Testosterone Is Effective and Safe as Gender-Affirming Hormone Therapy in Transmasculine and Gender-Diverse Adolescents and Young Adults: A Single Center's 8-Year Experience.
Laurenzano SE, Newfield RS, Lee E, Marinkovic M

Improving vitamin D testing and supplementation in children with newly diagnosed cancer: A quality improvement initiative at Rady Children's Hospital San Diego.
Shliakhtsitsava K, Fisher ES, Trovillion EM, Bush K, Kuo DJ, Newfield RS, Thornburg CD, Roberts W, Aristizabal P

Tildacerfont in Adults With Classic Congenital Adrenal Hyperplasia: Results from Two Phase 2 Studies.
Sarafoglou K, Barnes CN, Huang M, Imel EA, Madu IJ, Merke DP, Moriarty D, Nakhle S, Newfield RS, Vogiatzi MG, Auchus RJ

Diagnostic utility of fine needle aspiration cytology in pediatric thyroid nodules based on Bethesda Classification.
Jiang W, Phillips SA, Newbury RO, Naheedy JH, Newfield RS

Sociodemographic and clinical characteristics associated with vitamin D status in newly diagnosed pediatric cancer patients.
Aristizabal P, Sherer M, Perdomo BP, Castelao E, Thornburg CD, Proudfoot J, Jacobs E, Newfield RS, Zage P, Roberts W, Martinez ME

Undescended retropharyngeal parathyroid adenoma with adjacent thymic tissue in a 13-year-old boy with primary hyperparathyroidism.
Kordahi AM, Newfield RS, Bickler SW, Mo JQ, Khanna PC, Bykowski J, Bouvet M

Diagnosis and treatment of a boy with IPEX syndrome presenting with diabetes in early infancy.
Kadakia S, Farnaes L, Dimmock D, Chowdhury S, Ding Y, Anderson EJ, Kingsmore S, Newfield RS

The utility of intact parathyroid hormone level in managing hypocalcemia after thyroidectomy in children.
Jiang W, Lee E, Newfield RS

Neonatal diabetes mellitus due to a novel variant in the INS gene.
Laurenzano SE, McFall C, Nguyen L, Savla D, Coufal NG, Wright MS, Tokita M, Dimmock D, Kingsmore SF, Newfield RS

Non-alcoholic fatty liver disease in pediatric type 2 diabetes: Metabolic and histologic characteristics in 38 subjects.
Newfield RS, Graves CL, Newbury RO, Schwimmer JB, Proudfoot JA, Say DS, Feldstein AE

Chromosomal rearrangements in the 11p15 imprinted region: 17 new 11p15.5 duplications with associated phenotypes and putative functional consequences.
Heide S, Chantot-Bastaraud S, Keren B, Harbison MD, Azzi S, Rossignol S, Michot C, Lackmy-Port Lys M, Demeer B, Heinrichs C, Newfield RS, Sarda P, Van Maldergem L, Trifard V, Giabicani E, Siffroi JP, Le Bouc Y, Netchine I, Brioude F

Low vitamin D level in pediatric patients with new onset type 1 diabetes is common, especially if in ketoacidosis.
Al-Zubeidi H, Leon-Chi L, Newfield RS

Bone maturation along the spectrum from normal weight to obesity: a complex interplay of sex, growth factors and weight gain.
Klein KO, Newfield RS, Hassink SG

Mutational Analysis in Pediatric Thyroid Cancer and Correlations with Age, Ethnicity, and Clinical Presentation.
Nikita ME, Jiang W, Cheng SM, Hantash FM, McPhaul MJ, Newbury RO, Phillips SA, Reitz RE, Waldman FM, Newfield RS

Pediatric thyroid surgery and management of thyroid nodules - an institutional experience over a 10-year period.
Jiang W, Newbury RO, Newfield RS

Topical sulfonylurea as a novel therapy for hypertrichosis secondary to diazoxide, and potentially for other conditions with excess hair growth.
Newfield RS

Evaluation of the American-English Quality of Life in Short Stature Youth (QoLISSY) questionnaire in the United States.
Bullinger M, Sommer R, Pleil A, Mauras N, Ross J, Newfield R, Silverman L, Rohenkohl A, Fox J, Quitmann J

A 4-Year, Open-Label, Multicenter, Randomized Trial of Genotropin® Growth Hormone in Patients with Idiopathic Short Stature: Analysis of 4-Year Data Comparing Efficacy, Efficiency, and Safety between an Individualized, Target-Driven Regimen and Standard Dosing.
Counts DR, Silverman LA, Rajicic N, Geffner ME, Newfield RS, Thornton P, Carakushansky M, Escobar O, Rapaport R, Levitsky L, Rotenstein D, Hey-Hadavi J, Wajnrajch MP

Lipoprotein particle concentrations in children and adults following Kawasaki disease.
Lin J, Jain S, Sun X, Liu V, Sato YZ, Jimenez-Fernandez S, Newfield RS, Pourfarzib R, Tremoulet AH, Gordon JB, Daniels LB, Burns JC

See the full listing of this physician's publications on PubMed, a service of the National Library of Medicine.

PubMed is a third-party website and not affiliated with Rady Children's Hospital-San Diego.

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