In in vitro fertilization (IVF) cycles, the patient undergoes ovarian stimulation to obtain a greater number of mature eggs. Otherwise, only one ovarian follicle would develop in each menstrual cycle, which would give rise to a single mature egg.
However, it is subsequently necessary to perform a follicular puncture to extract the eggs that are inside the ovarian follicles. This is an intervention that needs to be scheduled at the right time and, for this, the gynecologist will rely on the follicular size and the estradiol concentration. In addition, these parameters will help the specialist to estimate the number of oocytes that can be extracted in the follicular puncture.