A hospital is defined as a health care institution that provides treatment using specialized medical staff and equipment. Hospitals provide diagnosis, therapy, prevention, education, and research. They classify as primary, secondary, or tertiary based on the severity of conditions treated. Hospitals organize departments into administrative, informational, therapeutic, diagnostic, and support services. Therapeutic services include physical therapy, occupational therapy, and pharmacy. Diagnostic services determine the cause of illness through tests. Hospital pharmacies procure, store, and dispense medications to inpatients and outpatients under a pharmacist's supervision. They are organized with dispensing, manufacturing, and storage areas.