A key component of IVF treatment is “controlled ovulation” treatment. Why is “controlled ovulation” used? Only one dominant follicle per menstrual cycle will eventually mature and ovulate, but the timing of ovulation of this follicle is difficult to pinpoint, the likelihood of getting an egg is low, and one egg may stall at some point during the in vitro fertilization process, plus not every egg is fertilized, and not every fertilized egg develops into a viable embryo that can be transferred. The goal of an ovulation protocol is therefore to obtain a sufficient number of eggs in a single treatment cycle to ensure the formation of embryos that can be transferred, thus increasing pregnancy rates and treatment efficiency.