Tran Thi Phuong Mai At: Hanoi Medical University CONTRIBUTIONS BY THIS DISSERTATION 1.Evaluation of ovarian stimulation results in IVF patients: This has been the very first research in Vietnam implemented with the research size in large scale evaluating in-vitro fertilization at National Hospital of Obstetrics and Gynecology, predictor factors of ovarian respond in-vitro fertilization the average days using FSH were 9.75 ± 1.00 days.