Sophia Yen, MD

  • “I take care of the entire patient, from head to toe.”

I chose pediatrics because I am all about prevention. Let's catch things early. Let's treat potential problems before they become big problems. One of my goals is to ensure that teenage girls and boys have access to comprehensive sexuality education and confidential reproductive health care. I also enjoy teaching patients and families how to prevent and treat diseases, pregnancy, and obesity.

The first visit might be the longest visit your child has ever had, but it will also be the most thorough. I like to take care of everything in one visit, so you don't have to keep coming back. Patients receive cutting-edge, up-to-date, evidence-based care at our clinic and, because we are an academic center, we can take more time with our patients. Our multi-disciplinary team also includes nutrition and social work.

I take care of the entire patient from head to toe, including the psychosocial aspects, including the unique challenges faced by teens such as acne, menses, and puberty. I want each patient to leave knowing that we have made sure all aspects of their health have been checked and their questions answered.


Adolescent Medicine

Work and Education

Professional Education

UCSF School of Medicine, San Francisco, CA, 1997


Children's Hospital Oakland, Oakland, CA, 1998


Children's Hospital Oakland, Oakland, CA, 2000


UCSF Adolescent Medicine, San Francisco, CA, 2003

Board Certifications

Adolescent Medicine, American Board of Pediatrics

Pediatrics, American Board of Pediatrics

All Publications

IUDs and Adolescents An Under-Utilized Opportunity for Pregnancy Prevention JOURNAL OF PEDIATRIC AND ADOLESCENT GYNECOLOGY Yen, S., Saah, T., Hillard, P. J. 2010; 23 (3): 123-128


Most pregnancies in adolescents are unintended and preventable if contraception were utilized. IUDs provide an under-utilized highly effective form of contraception. IUDs are appropriate for nulliparous women, including adolescents. IUDs do not increase: the incidence of Pelvic Inflammatory Disease after the 1st month of insertion, the odds of infertility, nor rate of ectopic pregnancy. Adolesecnts need more education about and increased access to IUDs. Practical points regarding IUD selection and insertion in adolescents are reviewed, including pain prophylaxis, anticipatory guidance, side effects and complications. In summary, IUDs are safe for contraception in most adolescents. IUDs are effective and eliminate the need for ongoing adherence and thus have the potential to decrease unplanned pregnancies.

View details for DOI 10.1016/j.jpag.2009.09.004

View details for Web of Science ID 000278173800002

View details for PubMedID 19896396

Feasibility of a dance videogame to promote weight loss among overweight children and adolescents ARCHIVES OF PEDIATRICS & ADOLESCENT MEDICINE Madsen, K. A., Yen, S., Wlasiuk, L., Newman, T. B., Lustig, R. 2007; 161 (1): 105-107

View details for Web of Science ID 000243273800018

View details for PubMedID 17199076

Bacterial vaginosis in sexually experienced and non-sexually experienced young women entering the military OBSTETRICS AND GYNECOLOGY Yen, S., SHAFER, M. A., Moncada, J., Campbell, C. J., Flinn, S. D., Boyer, C. B. 2003; 102 (5): 927-933


To estimate the prevalence of bacterial vaginosis by Nugent Gram stain criteria in a nonclinic national sample of young women entering recruit training; to examine clinical associations with bacterial vaginosis; and to evaluate the performance of a pH test card and Papanicolaou smear against Gram stain as screening tools for bacterial vaginosis.A cross-sectional study of 1938 women was conducted. Self-collected vaginal swabs were applied to a colorimetric pH test card and a glass slide for Gram stain evaluation according to the Nugent criteria. Papanicolaou smears and samples for sexually transmitted diseases screening were collected during routine entry pelvic examinations.Bacterial vaginosis prevalence was 27%, with 28% in sexually experienced and 18% in non-sexually experienced women (P = .001). Bacterial vaginosis prevalence was 11% in Asian/Pacific Islanders, which was lower than in other nonwhite ethnic groups (P = .004). Clinically, bacterial vaginosis was directly related to multiple sexual partners (P = .026), self-report of vaginal discharge (P = .001), self-report of vaginal odor (P < .001), and concurrent Chlamydia trachomatis infection (P = .002), and inversely related to hormonal contraceptive use (P = .013). Vaginal discharge did not achieve statistical significance in multivariate analysis. Compared with the Nugent criteria, the sensitivities and specificities for bacterial vaginosis diagnosis were as follows: colorimetric pH test: 72% and 67%; Papanicolaou smear: 72% and 79%, respectively.Among these diverse young women, bacterial vaginosis occurs commonly in both sexually experienced and inexperienced young women and differs by race and ethnicity. The pH colorimetric test and Papanicolaou smear performed moderately well as screening tools for bacterial vaginosis. The inverse relationship of bacterial vaginosis with hormonal contraceptive use and its direct relationship with C. trachomatis need further study.

View details for DOI 10.1016/S0029-7844(03)00858-5

View details for Web of Science ID 000186294400009

View details for PubMedID 14672465