doctor cassandra roeca shady grove fertility colorado

Cassandra Roeca, M.D.

Board Certified Board Certified

  • Obstetrics and Gynecology
  • Reproductive Endocrinology and Infertility

Languages Languages

  • English and Spanish
Patient Testimonial
I would highly, highly recommend Dr. O’Hern! Throughout my struggles with infertility, she has been kind, supportive, thoughtful, and determined to help me achieve a pregnancy. The staff at SGF, both in Clear Lake and the Medical Center, are amazing to work with!

Working with Dr. Kallen and his entire team was an absolute pleasure. They took time in designing a medical plan specific to our situation. Dr. Kallen never gave up on us and constantly reassured us at every step of the way to a successful pregnancy! We are very grateful for Dr. Kallen the SGF team!

Dr. Healy is so kind and selfless she is one of the kindest people that I’ve ever met. I definitely recommend her for any fertility treatments that people may need. We would never choose anyone else to handle our care. If you were looking for a fertility doctor, she is, hands-down, the best.

Dr. Mitchell and her team are dedicated to their patients in their journey to getting pregnant. She is so kind and always makes sure you are comfortable and understand what’s going on and next steps. She communicates so well with her team and patients and I cannot be more happy with my experience.

10 out of 10 recommend! From the first day we stepped foot in Dr. Shah’s office we could feel the amount of love and care him and his team give to their patients. Our fertility journey wasn’t easy but this clinic went above and beyond to make sure it was successful.

I switched to SGF because of our first visit with Dr. Shah. He has great bedside manner, clear communication, manages expectations, and has a great staff. He is very proactive with your healthcare and makes you feel cared for. 


Cassandra Roeca, M.D., earned her medical degree from the University of Colorado School of Medicine. She then started her postdoctoral training at Harvard Medical School, Brigham and Women’s Hospital/Massachusetts General Hospital to complete residency in Obstetrics and Gynecology. It was there that Dr. Roeca was awarded the Eman and Goldstein Pediatric Gynecology Award. A Colorado native, Dr. Roeca returned to the University of Colorado School of Medicine, Anschutz Medical Campus where she completed her fellowship in Reproductive Endocrinology and Infertility (REI).

Dr. Roeca is board certified in obstetrics and gynecology and reproductive endocrinology and infertility. Dr. Roeca is passionate about fertility preservation in patients with cancer or medical diagnoses that place them at risk of infertility. Dr. Roeca is interested in researching solutions to help patients overcome infertility hurdles and fulfill their dreams of having a healthy baby. She is also an advocate for improving access to fertility services.

An avid researcher, Dr. Roeca has authored several peer-reviewed publications on topics such as preimplantation genetic testing, fertility preservation, menopause and in vitro fertilization, as well as contributed to an article on ovulation. Her degree in molecular, cellular, and developmental biology, influences her expertise in the diagnosis and treatment of infertility for patients with cancer, genetically linked mutations, and transmitted diseases.

Dr. Roeca is a member of several professional organizations, including the American Congress of Obstetricians and Gynecologists (ACOG), American Medical Association, American Society for Reproductive Medicine (ASRM), and Society for Reproductive Endocrinology and Infertility (SREI). She has also presented her research on birth outcomes, placental function and in vitro fertilization at several national meetings.

Dr. Roeca sees patients at SGF Colorado’s Denver location. In her free time, you can find Dr. Roeca enjoying the Colorado mountains with her husband and three children as well as playing music.

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  • Residency: Obstetrics and Gynecology, Harvard Medical School, Brigham and Women’s Hospital/Massachusetts General Hospital
  • Fellowship: Reproductive Endocrinology and Infertility, University of Colorado School of Medicine, Anschutz Medical Campus
  • Castle Connolly Rising Star, 2024
  • Fertility Preservation Special Interest Group Prize Paper (ASRM 2022)
  • Eman and Goldstein Pediatric Gynecology Award, Brigham and Women’s/Boston Children’s Hospital
  • President’s Presenter’s Award, Society of Reproductive Investigation
  • Coroporate Member Counsel In-Training Travel Award, American Soceity for Reproductive Medicine
  • Colorado Fertility Advocates – Board Member
  • American Congress of Obstetricians & Gynecologists
  • American Society for Reproductive Medicine
  • Society for Reproductive Endocrinology and Infertility
  • American Medical Association
  • Oncofertility Consortium
  • Lersten I, Fought A, Yannetsos C, Sheeder J, Roeca C. Patient Perspectives of Telehealth for Fertility Care: A National Survey. Submitted for review.  
  • Siegle D, Kramer W, Sheeder J, Roeca C. Are Donor-Conceived People Willing to Use Donors Themselves? Insights from Individuals Conceived via Donor-Assisted Reproduction. Hum Reprod. 2022. Aug;37(9): 2087-2094.  
  • Clain E, Johnson J, Roeca C. Triggered with COVID: what are my chances, Doc? Fertil Steril. 2022. Apr;117(4):781-782. 
  • Rushing JS, Appiah L, Polotsky AJ, Murray S, Foust E, Hassell K, Roeca C. Ovarian stimulation for fertility preservation in an oncology patient with etonogestrel implant in place. J Asist Reprod Genet. 2021. Feb;38(2): 513-516.  
  • Woodruf T, Ataman L, et al, Roeca C, et al. A View from the Past Into our Collective Future: The Oncofertility Consortium Vision Statement. J Assist Reprod Genet. 2021 Jan;38(1):3-15.  
  • Santoro N, Roeca C, Peters Samuelson B, NealPerry G. The Menopause Transition: Signs, Symptoms and Management Options. J Clin Endocrinol Metab. 2021 Jan 1;106(1):1-15. 
  • Roeca C, Johnson R, Truong T, Carlson N, Polotsky AJ. Birth Outcomes are Superior after Transfer of Fresh versus Frozen Embryos for Donor Oocyte Recipients. Hum Reprod. 2020 Dec 1;35(12):2850-2859. 
  • Roeca C, Silva E, Barentsen C, Powell TL, Jansson T. Effects of vitrification and the superovulated environment on placental function and fetal growth in an IVF mouse model [published online ahead of print, 2020 Jul 3]. Mol Hum Reprod. 2020;gaaa047. doi:10.1093/molehr/gaaa047 
  • Roeca C, Johnson R, Carlson N, Polotsky AJ. Preimplantation genetic testing and chances of a healthy live birth amongst recipients of fresh donor oocytes in the United States [published online ahead of print, 2020 Jul 2]. J Assist Reprod Genet. 2020;10.1007/s10815-020-01874-8. doi:10.1007/s10815-020-01874-8 
  • Roeca C, Dovey S, Polotsky AJ. Recommendations for assessing ovarian health and fertility potential in survivors of childhood cancer. Maturitas. 2019. Apr 122:57-59. 
  • Leech AA, Bortoletto P, Christiansen C, Drainoni ML, Linas BP, Roeca C, Curtis M, Sullivan M. Assessing access to assisted reproductive services for serodiscordant couples with human immunodeficiency virus infection. Fertil Steril. 2018. Feb 7.  
  • Roeca C, Polotsky AJ. Influenza vaccination in early pregnancy. Vaccine. 2017. Dec 21. 
  • Cassandra Roeca, Sarah E. Little, Daniela A. Carusi. Pathologically diagnosed placenta accreta and hemorrhagic morbidity in a subsequent pregnancy. Obstet Gynecol. 2017 Feb;129(2):321-326.  
  • Villavicencio AT, Babuska JM, Ashton A, Busch E, Roeca C, Nelson EL, Mason A, Burneikiene S.Prospective Randomized double blinded clinical study evaluating the correlation of clinical outcomes and cervical sagittal alignment. Neurosurgery 2011. 
  • Gano LB, Donato AJ, Pierce GL, Hamza M, Magerko KA, Roeca C, and Seals DR. Increased proinflammatory and oxidant gene expression in circulating mononuclear cells in older adults: amelioration by habitual exercise. Physiological Genomics 2011. 
  • Villavicencio AT, Burneikiene S, Roeca CM, Nelson EL, Mason A. Minimally invasive versus open transforaminal lumbar interbody fusion. Surg Neurol Int 2010;1:12. 


As a young girl I was taught many baseless things about contraception and reproduction, so to better educate myself, I pursued the study of developmental biology as an undergraduate where I was introduced to hormone function and embryonic development. During my medical training, reproductive endocrinology became a natural path to follow based on my interest in reproductive health. As I cared for more infertility patients, I became passionate about finding and researching solutions to help patients have a healthy baby. I am thankful my path led me to become a reproductive endocrinologist because I am not sure there is a more rewarding job than helping people build their families.

Listening to my patients and their experience is the single most important thing I can do to understand why someone is struggling. It is important to me that my patients feel heard. This provides a basis for trust, mutual respect, and shared decision making so, together, we can effectively help them achieve their reproductive goals.

I am always inspired by my patients. Their willingness to be emotionally vulnerable about their most personal experiences in my office is inspiring. I see strong people every day in my office who are walking a long, difficult path and display such tenacity and courage; I am inspired daily to go above and beyond to help my patients achieve their reproductive goals.

SGF is known as a pioneer in many ways, shown through their commitment to research, innovation, collaboration, and education. I’m proud to be a part of a practice of this caliber, home to award-winning physicians who continuously and safely push the envelope and offer the very finest in care.

My mom is my biggest inspiration. She immigrated to the U.S. from Guatemala after high school. Despite her interest in science, where she was raised prevented her from pursuing medicine as a female. My mom eventually became a nutritionist and dietician and raised me to understand that how we nourish our bodies is a form of medicine, too. She always fostered my love of science and has remained a constant inspiration to never take my opportunities for granted.

I love spending time with my husband and our three children. We are avid skiers and go to the mountains often. We enjoy seeing extended family whenever we can. I also enjoy being active outdoors, dinner parties with friends, and playing music.

I am charismatic, compassionate, and inquisitive. I tend to see the glass as “half full” but am also pragmatic.

I raced in triathlon collegiate national championships as an undergraduate.