A vaginal preparation for the diagnosis of human female uterotubal patency and function, comprising particles having a nucleus absorbable by the tissues of the human body, and a coating for the nucleus which is dissolvable and non-absorbable by the tissues of the human body, inert and innocuous, the nucleus comprising at least one marker that can be released by the human body through an organic fluid, the coating being dissolvable and sensitive, for the purpose of the dissolution thereof, to time and/or changes in pH and/or temperature and/or another chemical/physical parameter along the route from the vaginal area to the tubal and pelvic area, the particles having a size, weight and ovoid shape corresponding approximately to those of spermatozoa.