The main contents of a Hygienic-Sanitary report are listed below, once a few premises on the definition and objectives of hygiene, and on the normative pertaining Hygienic-Sanitary reports in the context of sanitary constructions planning are set. A hospital is a complex organism, and it must be planned as an "organized system" in which the various activities are disposed in the functional spaces according to a well-defined layout. In a Hygienic-Sanitary report, one should always remember that the correct approach to a hospital construction or restructuring project must be first urbanistic, with a precise diagram of fluxes and functions, and only then architectonic, with the consequent hospital typology. Different organizational models of the functional zones and of the relative traffic fluxes correspond in fact to different architectonical typologies.