Skip to Main Content

Thalia Segal


Fertility specialist
Reproductive endocrinologist

Dr. Thalia Segal is a specialist in diagnosing and treating the causes of infertility and reproductive disorders. Her areas of expertise include fertility preservation (egg freezing), individualizing protocols for in vitro fertilization (IVF), preimplantation genetic diagnosis (checking embryos for genetic defects), polycystic ovarian disease and LGBTQ family building.

Segal has a special interest in how environmental toxins and pesticides may impact fertility and IVF outcomes. In collaboration with the Environment and Reproductive Health (EARTH) Study of the Harvard T.H. Chan School of Public Health, she studied the effects of DEET insect repellent on semen parameters. This work won an in-training travel grant from the American Society for Reproductive Medicine. With the UCSF Program on Reproductive Health and the Environment, she is currently working to investigate the effects of the 2018 Camp Fire – the most devastating fire in California history – on reproductive outcomes.

Segal earned her medical degree at Albert Einstein College of Medicine. She completed a residency in obstetrics and gynecology at Northwell Health, followed by a fellowship in reproductive endocrinology and infertility at University Hospitals Cleveland Medical Center, an affiliate of Case Western Reserve University School of Medicine.

Segal is chair-elect of the Environment and Reproduction Special Interest Group, a national organization that advocates for research, awareness and health policies on toxic chemicals in drinking water and commonly used products that may be contributing to infertility. She is a member of the American Society for Reproductive Medicine. She has authored many publications on a range of topics in reproductive medicine for leading medical journals. She has received several grants and awards for her research, which she has presented at national and international conferences.

Segal believes that everyone has a right to fertility treatments. As a member of RESOLVE, a national infertility advocacy group, she met with state representatives and their staff to promote IVF insurance coverage for every resident in California. She is also working on creating a nonprofit program to give individuals with cancer or genetic diseases access to life-changing treatments, such as fertility preservation and preimplantation genetic diagnosis.

  • Education

    Albert Einstein College of Medicine, 2011

  • Residencies

    Northwell Health, Obstetrics and Gynecology, 2015

  • Fellowships

    University Hospitals, Case Western Reserve University, Reproductive Endocrinology and Infertility, 2018

  • Board Certifications

    Obstetrics and Gynecology, American Board of Obstetrics and Gynecology

The most important thing I can do is listen to my patients and be a partner on each unique journey to parenthood.

Where I see patients (2)

    My reviews


    Overall Experience
    94 Ratings
    About our process
    Sep 07, 2022
    I always enjoy discussing with my actual care provider. It's just getting to the point to talk to the care provider whether scheduling wait times conflicting advice that is incredibly difficult and disappointing at a renowned facility like UCSF Health.
    Aug 11, 2022
    I got my hopes up after hearing number of eggs retrieved and then hearing that most likely all of them could be mature and good to freeze. It ended up that a little over 50% were mature and good to freeze. I wish after the retrieval the messaging was "you did well. The lab will look and we'll wait and see". I was disappointed after hearing my number relative to number of eggs retrieved but could have avoided this disappointment.
    Jul 29, 2022
    Provider seemed aloof and disengaged. Provider does seem well informed which is why we will continue with her.
    Jul 18, 2022
    The provider was very nice caring and supportive and answered questions I had regarding the procedure.
    May 21, 2022
    This was an embryo transfer procedure so not with my regular doctor. Of course I would've preferred the transfer be done by my own doc.
    May 02, 2022
    This was an egg retrieval surgery that I have as part of my IVF treatment cycle. I did not find out until 2 days later as I was reading this visit notes on MyChart that they couldn't access my right ovary to retrieve eggs. No one told me this. I had to find out on my own from MyChart. Turns out this can sometimes happen but we never discussed alternatives such as going thru my uterus my abdomen if this situation occurred. I was never given that option. So only 3 eggs were retrieved from my left ovary. We could have had more eggs maybe double that amount
    Aug 27, 2021
    Provider was communicative every step of the way. Even though I've been in for many of these visits she was particularly thoughtful and gentle during the ultrasound exam.
    Jul 09, 2021
    She was ok but overall I feel that most of the people at this building are very dry. You would think that they would be a lot nicer and warm since these are patients that are trying to conceive and that alone is stressing. I am new to this hospital but I can definitely say after going to different hospitals In the past that this one Is the coldest In terms of treating patients