Pediatric Nephrologists

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Pediatric Nephrologists

Nephrology is the study of the function and diseases of the kidneys. Our nephrologists are specially trained to take care of pediatric transplant patients.

Dr. Arar Mazen Arar, MD
Professor of Pediatrics
UT Health San Antonio 

Dr. Arar is the Medical Director of the Pediatric Dialysis Program and Pediatric Kidney Transplant Program at University Hospital. He received his medical degree from the University of Jordan Medical School in 1980. He completed his pediatric nephrology fellowship at University of Texas Southwestern Medical School in Dallas, Texas in 1992.  He is board certified in Pediatric Nephrology.  Dr. Arar is actively involved in both basic and clinical research.  His areas of interest are in kidney development, end stage renal disease and kidney transplantation.   


Dr. Ranch Daniel Ranch, MD
Assistant Professor of Pediatrics
UT Health San Antonio

Dr. Ranch received his medical degree from Chulalongkorn University in Bangkok, Thailand in 2003. He completed his pediatric nephrology fellowship at the University of California in San Francisco, California in 2010.  Dr. Ranch is board certified in both Pediatrics and Pediatric Nephrology.  His research interests include cardiovascular complications in chronic kidney disease, including kidney transplant patients.  Also, Dr. Ranch himself is a living kidney donor, and is an active advocate for enhancing the safety of living organ donation.


DR. Yamaguichi Ikuyo Yamaguchi, MD, PhD
Associate Professor of Pediatrics
UT Health San Antonio 

Dr. Yamaguchi received her medical degree at Kumamoto University and her PhD from Kurume University in Japan. She completed her pediatric training at Georgetown University Medical Center in Washington, D.C. in 2002 and pediatric nephrology training at Seattle Children’s Hospital in 2006. She is board-certified in pediatric nephrology and has clinical interests in hypertension, chronic kidney disease and renal transplantation. Her research interest is to understand the role of the microvasculature in acute and chronic renal diseases. Dr. Yamaguchi has presented her research at many regional and national nephrology conferences and published numerous papers in peer-reviewed journals. She is a member of the American Society of Nephrology and the American Society of Pediatric Nephrology.