Nanette Santoro, M.D.

Board Certified Board Certified

  • Obstetrics and Gynecology
  • Reproductive Endocrinology and Infertility
Patient Testimonial
I began my own egg-freezing journey as an OB/GYN resident. Looking back 10 years later, now 38 years old, engaged, and ready to start my own family, I’m relieved to have frozen my eggs. At the same time, I feel obligated to give back and address the toll that surgical training has on women.

– Valerie Libby, M.D., M.P.H. | SGF Atlanta | Program Lead |

SGF in Alpharetta is fantastic. The office is beautiful and brand new. The office and clinical staff are friendly, they make you feel comfortable and they are very accommodating. I have never had to wait long for my appointment.

I have only wonderful things to say about Dr. Gay and his staff at the Alpharetta location. Knowledgeable, compassionate, and professional… I could not have asked for better care.

Dr. Swelstad has somehow perfected the difficult balance of being thoroughly educated and up to date in his field and patient and kind enough to make you feel important to him.

Dr. Libby was just amazing. We had a long journey and she was right there with us in the trenches. She was our third fertility doctor. She thought outside the box, was willing to try new things, was open to our questions, and used her team to help us.

I went through IVF with Dr. Humm. I felt heard, comforted, and comfortable the whole way. The support staff were beyond fantastic and turned what would have been a scary experience, into something that my husband and I never felt like we were navigating alone.


Nanette Santoro, M.D., completed her medical training in the 6-year B.S.-M.D. program at Rensselaer Polytechnic Institute and Albany Medical College, followed by residency at Beth Israel Medical Center in New York City and a fellowship in Reproductive Endocrinology at Massachusetts General Hospital, where she remained on faculty for 3 years prior to joining the faculty at New Jersey Medical School in 1988.

She helped recruit talent to make the University of Colorado’s Department of OB/GYN #8 in the country for NIH funding in 2017. Over the course of her career thus far, Dr. Santoro has personally mentored over 100 students, residents, postdoctoral fellows, and junior faculty, many of whom have gone on to illustrious academic careers.

An accomplished researcher, Dr. Santoro’s current exploration involves treatment of menopausal symptoms in women, understanding the mechanisms by which obesity causes relative infertility in women, participating in clinical trials in reproductive medicine, and research training of OB/GYNs and reproductive endocrinologists. Dr. Santoro worked closely with the former CU ARM laboratory, which specialized in the development and measurement of reproductive hormones using state-of-the-art methodologies.

Dr. Santoro has developed techniques to perform field studies that allow for daily hormone assessments without the inconvenience of blood drawing by using urine sampling. She is past Chair of the Steering Committee for the Reproductive Medicine Network, and current principal investigator with the CONFIRM network, both NIH-funded clinical trial networks devoted to the study of problems in human reproduction.

In addition to her extensive research, Dr. Santoro has authored over 300 peer-reviewed scientific publications and edited four books. Additionally, Dr. Santoro has held leadership positions with numerous professional organizations and is currently President-Elect of the Society for Reproductive Investigation. Among Dr. Santoro’s decorated career of achievements, she was elected to the National Academy of Medicine in 2018. Dr. Santoro has been named a Castle Connelly “Best Doctor” and “Best Doctor in America” as well as a “Best Doctor” by New YorkMagazine and “Top Doc” by 5280 Magazine.

Dr. Santoro sees SGF Colorado patients at the Denver office, while also maintaining her position at CU treating women for complex menopause management. Dr. Santoro will continue to provide training to the University of Colorado Reproductive Endocrinology and Infertility fellowship program.

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  • Residency: Obstetrics and Gynecology, Beth Israel Medical Center
  • Fellowship: Reproductive Endocrinology and Infertility, Massachusetts General Hospital
  • Best Doctors, Good Housekeeping Magazine, 1997
  • Best Doctors, Castle Connolly, 1999-2014
  • Best Doctors, New York Magazine, 2001, 2003-2006
  • Denver’s Top Doctors, 5280 Magazine, 2016-2021
  • Mentor of the Year, Clinical Research Training Program, Albert Einstein College of Medicine, 2006
  • Best Doctor, Best Doctors in America, 2008-2014
  • Award for Outstanding Achievement in Women’s Health Research, Society for Women’s Health Research, 2015
  • Outstanding Mentor Award, Endocrine Society, 2016
  • American Association for Gynecologists and Obstetricians Foundation
  • American Board of Obstetrics and Gynecology, Inc.
  • American Gynecologic and Obstetrical Society
  • American Society for Reproductive Medicine
  • Endocrine Society
  • National Academy of Medicine
  • North American Menopause Society
  • Society for Reproductive Endocrinology and Infertility
  • Society for Reproductive Investigation

Coming Soon!


As a resident, I met several role models who helped further spark my interest in the field of reproductive endocrinology. It became clear to me that helping people create or expand their families was one of the most rewarding things I could possibly do with my life.

Reproduction is the most significant process that we do as humans. If reproduction does not work, that is the end of our species!

 I feel that it’s most important to cultivate and maintain the understanding that I am a member of my patients’ team. I am on their side. There can be so much unbearable frustration involved in prolonged fertility treatment, and I feel it is important for me not to look away and to make sure my patients know I am with them for the duration of the journey, no matter the outcome.

As a child, I was obsessed with Marie Curie and read her biography over and over. I usually never read a book twice!

Scuba diving, hiking, and cooking.

I love nature and hiking in Colorado is one of the best ways to enjoy it. Scuba diving is like hiking but underwater – it offers same feeling but with more equipment! Also, who doesn’t love eating a delicious and beautifully presented meal with friends and family?

I’m a sunny optimist for sure.

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