The authors deal with organizational and technical aspects concerning otorhinolaryngological day hospital's management. They explain purposes and reasons leading to the establishment of this sort of service; they analyse related problems and the adopted methodologies for simplifying admission procedures. They report a statistical survey regarding the period from May 1991 to May 1994, concerning surgical and medical operations, and instrumental diagnostic researches performed at the IV ENT Department of "La Sapienza" University of Rome. The statistical analysis concerning the 1526 patients sent to this department, shows the downright prevalence of surgical operations performed in operating room (52%). Ambulatory operations and instrumental diagnostic researches account respectively for 39.6% and for 29.3% of all hospitalizations. Among all surgery operations performed in operating room stand out the notice incidence of therapeutical and diagnostic microlaryngoscopies. The most frequent ambulatory operations were the removal of tracheal cannula (21%), while TC was the most frequent of all instrumental diagnostic researches. A careful selection of patients, on the basis of their general condiction, account for the low incidence of subjects not discharged within 24 hours. After having analyzed the survey's data, the authors underline advantages and finalities of day hospital: a shorter hospital stay, reduction of hospitalization's costs, and a larger related number of patients to be contented. Finally they hope that this sort of service will spread more.