The University of Colorado Division of Reproductive Endocrinology and Infertility (REI) is a comprehensively skilled team of experts, committed to meeting each patient’s unique fertility needs through a full range of patient care and through advancing both education and research in the area of reproductive medicine. Our success rates are outstanding, as we specialize in the evaluation and treatment of infertility and reproductive disorders, providing personalized care ranging from basic infertility treatment to the most advanced in vitro fertilization technologies available. All of our faculty physicians have completed formal fellowship training in reproductive endocrinology and infertility. Each is board certified in obstetrics and gynecology and board certified or eligible for board certification in the subspecialty of reproductive endocrinology and infertility.

Our division's faculty members practice out of the CU Advanced Reproductive Medicine (ARM) clinics in Denver's Stapleton neighborhood the Colorado Springs location in Briargate. We are proud be a member of the Society for Assisted Reproductive Technology (SART), the gold standard in reporting IVF outcome data. It is our mission to provide the finest in Reproductive Endocrinology and Infertility care in a compassionate and professional environment.
Our faculty have a mission of advancing the reproductive endocrinology and infertility field through the education of current and future women’s health physicians and researchers. We are dedicated to the training of medical students and residents, and have an established Reproductive Endocrinology and Infertility (REI) Fellowship where we will train the next generation of reproductive medicine specialists.

Division of Reproductive Endocrinology and Infertility Education Mission



Learn more about our fellowship program:

The REI Division is dedicated to the education and empowerment of the infertility community through our involvement in local and national associations, awareness campaigns and advocacy for infertility policy changes that can improve patient access to treatment.

Division of Reproductive Endocrinology and Infertility Community Impact Mission

Over 1500 Babies Born

Since we started offering IVF, over 1500 babies have been born from embryo transfers performed at our program.

Superior Singleton Live Birth Rates

CU ARM consistently achieves superior singleton live birth rates per cycle compared to state and national averages, which is the gold standard for measuring success.

SART Member Since 1999

CU ARM has been a SART member in good standing since 1999, which assures honest and transparent reporting of our success rates.

Excellence in Lab Direction

IVF Lab Director, Liesl Nel-Themaat, PhD, HCLD, holds numerous national and international leadership positions, including: President Elect for SRBT, Practice Committee Member of SART, Membership Committee member for CRB. She served on the SRBT COVID-19 task force and as a core team member of the International IVF Initiative during COVID-19 as well.


Contact Info

Jacqueline Ansel
Division Administrative Director
12631 East 17th Avenue
Room 4210, B198-1
Aurora, CO 80045

Phone: (303) 724-8282



Clinic Info