Reproductive Endocrinology and Infertility or REI MDs are sub-specialists: we train in Obstetrics and Gynecology (OB/Gyn) then do advanced study of male & female hormonal conditions (endocrinology) and infertility testing and treatment including IVF. REI should be board-certified, except for a few older docs. Ob/Gyn MDs offer prenatal care, delivery, gynecologic care & surgery. Fertility specialists can help you get pregnant, including women with recurrent miscarriage, and look after you in early pregnancy, before transferring your care to an Ob/Gyn when you’re ready to graduate from our program!