Modern hospitals are complex health-care institutions that provide a wide range of services to individuals and communities. Their functions have expanded considerably from the traditional role of treating sick persons. A modern hospital combines curative, preventive, promotive, rehabilitative, educational, research and administrative activities. These functions are performed through coordinated efforts of doctors, nurses, technicians, administrators and other health professionals. The major function of a modern hospital is to provide diagnostic and curative services. Hospitals diagnose diseases through clinical examination, laboratory investigations, radiological procedures and other specialized tests. They provide medical treatment, surgical care, emergency services and specialized services for different diseases and conditions. Outpatient and inpatient departments enable hospitals to provide continuous care according to the needs of patients. Another important function is emergency and critical care. Modern hospitals maintain emergency departments to manage accidents,