Since the reorganization of the Gynecology and Obstetrics service in 2008, thanks to the change of location of the Hospital Puerta de Hierro, various research projects have been carried out, both in the gynecological and obstetrical fields, which have resulted in the publication of several doctoral theses, the publication of books and book chapters, both national and international, and 8 scientific research articles in international impact journals. The group has a project achieved through a competitive call, at the national level by the Ministry of Health with the title “Double-blind randomized controlled trial to determine the effect of natural vaginal progesterone on the continuation of gestation in women with threatened abortion Tra-025”.”