During a woman’s normal menstrual cycle, LH and FSH are the hormones that the body uses to stimulate development and maturation of a single oocyte. In order to optimize your pregnancy rates during IVF, it is important to have more than one mature oocyte available for fertilization, embryo development and transfer into the uterus. The ovaries are therefore stimulated using higher levels of the stimulating hormone that naturally exist in your body. (This is achieved using Gonadotrophin injections). Many different stimulation regimes exist at the moment, and the physician chooses the one best suited to your biological system, in order to achieve a good number of high quality oocytes. Close monitoring of the follicles (the sacs that contain the growing oocytes in the ovaries) is required and is achieved with frequent ultra-sound in order to determine their size and their numbers. At the appropriate timing, an additional amount of hormones will be administered, aiding with the final maturation of the oocytes. Based on all the available feedback and laboratory findings, the most suitable time for the recovery will be determined.