A case report of clinical pregnancy in which oocyte retrieval was carried out in the early follicular phase of the menstrual cycle

Abstract

To report a clinical pregnancy after frozen embryo transfer (FET) for which oocyte was picked up in the early follicular phase of the menstrual cycle. A 40-year-old woman with a two-year history of primary infertility was recruited. After in vitro fertilization (IVF), the embryo underwent vitrification cryopreservation process and FET was carried out five months later. The patient successfully conceived after FET. Follicle recruitment and selection cannot only be performed during a female patient's interovulatory interval (IOI), but oocytes can also be picked up in the early follicular phase of the menstrual cycle conception through IVF, embryo vitrification cryopreservation, and FET. Oocyte retrieval in the early follicular phase of the menstrual cycle increases the chances of an infertile female to conceive, especially in cancer patients and in women with poor ovarian response (POR).