This descriptive study aimed to characterize the profile of 167 subjects who were treated at the Ambulatory Surgical Center of a University Hospital in São Paulo State and procedures realized at the Ambulatory Surgical Center, as well as to identify the biological and psychosocial needs of these patients. Data were obtained through a semistructured interview and patients' files and were subject to descriptive analysis. The group was characterized by an equal number of individuals from both genders; average age was 51 years and socioeconomic levels were poor. The most common surgical and anesthetic procedures were ophthalmologic procedures and use of local anesthesia with or without sedation. The biological needs were: altered arterial pressure, electrocardiographic alterations, use of medication, allergy to medication, prolonged fasting, nausea, vomiting and pain. The psychosocial needs were: worry, fear, anxiety, discomfort caused by waiting for the realization of procedures and doubts or lack of information concerning perioperative care.13208-15