REI specialists treat problems related to the female reproductive tract, such as infertility, endometriosis, recurrent pregnancy loss, and polycystic ovary syndrome (PCOS). These doctors receive many years of training following medical school – four years of residency in Obstetrics and Gynecology, followed by two-three years of subspecialty Fellowship training in Reproductive Endocrinology and Infertility (REI).

Such experts specialize in treatments including intrauterine insemination (IUI), in vitro fertilization (IVF), third party reproduction (such as egg donor or gestational carrier/surrogacy), and minimally invasive surgeries (e.g., hysteroscopy and laparoscopy).