Hysteroscopy can play an important role in planned parenthood, e.g., in marriages where the woman is infertile. Infertility is usually connected with certain organic changes within the uterine cavity. There are different methods available for examining the cavity; the hysteroscopic method has the advantage of using carbon dioxide to fill the cavum uteri instead of NaCl or a solution of dextran. The method shows even small organic changes which can be the reason for intrauterine sterility. Together with endoscopy, hysteroscopy helps to reveal the situation of the genitalia.