In Vitro Fertilization (IVF)
During ovarian stimulation, the woman is submitted to frequent ultrasound checks. Given that the developing eggs secrete increasing quantities of estrogens, frequent hormone blood tests are also required. Each time, the medication dose to continue the stimulation is decided along with the date for retesting, in order to assess egg growth, avoid potential complications (overstimulation), and determine the most appropriate time for egg retrieval and embryo transfer.
A very small percentage of women who commence treatment for IVF may be required to suspend it, if the ovarian response to the treatment is not the anticipated. In specific, difficult cases, screening and monitoring is more thorough and specialized.