Ron Newfield, M.D.




Rady Children's Specialists of San Diego

Medical Group / IPA

Rady Children's Specialists

Other Languages



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 Gender Management Clinic.

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.


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

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

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

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

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

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

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

Age at the time of sulfonylurea initiation influences treatment outcomes in KCNJ11-related neonatal diabetes.
Thurber BW, Carmody D, Tadie EC, Pastore AN, Dickens JT, Wroblewski KE, Naylor RN, Philipson LH, Greeley SA, United States Neonatal Diabetes Working Group

The development and utility of a novel scale that quantifies the glycemic progression toward type 1 diabetes over 6 months.
Sosenko JM, Skyler JS, Beam CA, Boulware D, Mahon JL, Krischer JP, Greenbaum CJ, Rafkin LE, Matheson D, Herold KC, Palmer JP, Type 1 Diabetes TrialNet and Diabetes Prevention Trial–Type 1 Study Groups

Successful use of long acting octreotide in two cases with Beckwith-Wiedemann syndrome and severe hypoglycemia.
Al-Zubeidi H, Gottschalk ME, Newfield RS

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

Codon Arg15 mutations of the AP2S1 gene: common occurrence in familial hypocalciuric hypercalcemia cases negative for calcium-sensing receptor (CASR) mutations.
Hendy GN, Canaff L, Newfield RS, Tripto-Shkolnik L, Wong BY, Lee BS, Cole DE

A four-year, open-label, multi-center, randomized, two-arm study of Genotropin® in patients with idiopathic short stature: comparison of an individualized, target-driven treatment regimen to standard dosing of Genotropin® - analysis of two-year data.
Counts DR, Silverman LA, Geffner ME, Rajicic N, Hey-Hadavi J, Thornton PS, Wajnrajch MP, ISS Study Group

Acceleration of the loss of the first-phase insulin response during the progression to type 1 diabetes in diabetes prevention trial-type 1 participants.
Sosenko JM, Skyler JS, Beam CA, Krischer JP, Greenbaum CJ, Mahon J, Rafkin LE, Matheson D, Herold KC, Palmer JP, Type 1 Diabetes TrialNet and Diabetes Prevention Trial–Type 1 Study Groups

The prediction of type 1 diabetes by multiple autoantibody levels and their incorporation into an autoantibody risk score in relatives of type 1 diabetic patients.
Sosenko JM, Skyler JS, Palmer JP, Krischer JP, Yu L, Mahon J, Beam CA, Boulware DC, Rafkin L, Schatz D, Eisenbarth G, Type 1 Diabetes TrialNet Study Group, Diabetes Prevention Trial-Type 1 Study Group

Policy challenges in the fight against childhood obesity: low adherence in San Diego area schools to the California Education Code regulating physical education.
Consiglieri G, Leon-Chi L, Newfield RS

Self-limiting hematuria following growth hormone provocative testing with arginine hydrochloride.
Marinkovic M, Newfield RS

Third-trimester pregnancy complications.
Newfield E

Consider these points if you are a expert witness.
Rosenblum J

Ease of use and preference for a new disposable self-injection pen compared with a reusable pen for administering recombinant human growth hormone: A multicenter, 2-month, single-arm, open-label clinical trial in patient-caregiver dyads.
Hey-Hadavi J, Pleil A, Deeb LC, Fuqua JS, Silverman LA, Reiner B, Newfield R, Rajicic N, Wajnrajch MP, Cara JF

The accidental introduction of invasive animals as hitchhikers through inanimate pathways: a New Zealand perspective.
Toy SJ, Newfield MJ

ACTH receptor blockade: a novel approach to treat congenital adrenal hyperplasia, or Cushing's disease.
Newfield RS

Disability insurance and the physician practice: a primer for physicians and office managers.
Newfield J, Frankel J

Postoperative cognitive dysfunction.
Newfield P

Rapid weight gain in children soon after diagnosis of type 1 diabetes: is there room for concern?
Newfield RS, Cohen D, Capparelli EV, Shragg P

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.