The subsequent volumes of "Gynecological Endocrinology" already signal in their title the expansion of the field, which results from the numerous developments in recent years. This includes, for example, the detection and significance of new hormones, new functional tests, therapy with female sex hormones, the study of environmental influences, as well as diagnostic and surgical techniques in fertility surgery. Thus, the current state of knowledge in this specialty is comprehensively and thoroughly presented for the German-speaking region. With numerous graphics and tables, as well as excellent visual material, the volumes of Gynecological Endocrinology and Reproductive Medicine serve as an important companion for gynecologists in both clinical and practice settings.