Diagnostic Services facilitates the provision of timely, cost-effective, and high quality diagnostic care in safe and secure environments. It includes the clinical services of Pathology and Laboratory Medicine, Radiology, and Nuclear Medicine . These services function in the settings of ambulatory care, acute care, mental health, geriatric and rehabilitative care. Facility based diagnostic service employees include physicians, nurses, technicians, technologists, administrators, as well as program assistants and analysts. Combining these diagnostic services and employees into an interdisciplinary group facilitates the sharing of knowledge and permits uniformity of practices and policies. The use of diagnostic tests is a crucial aspect of clinical practice since they assist clinicians in establishing whether a patient has or does not have a particular condition. In order for any clinical test to be used most appropriately, it is essential that several parameters be established regarding the test and that these are made known to clinicians to inform their clinical decision making.