A psychiatrist is a physician who specializes in psychiatry, the branch of medicine devoted to the diagnosis, prevention, study, and treatment of mental disorders. Psychiatrists are physicians and evaluate patients to determine whether their symptoms are the result of a physical illness, a combination of physical and mental ailments or strictly mental issues. Sometimes a psychiatrist works within a multi-disciplinary team, which may comprise clinical psychologists, social workers, occupational therapists, and nursing staff. Psychiatrists have broad training in a biopsychosocial approach to the assessment and management of mental illness. As part of the clinical assessment process, psychiatrists may employ a mental status examination; a physical examination; brain imaging such as a computerized tomography, magnetic resonance imaging, or positron emission tomography scan; and blood testing. Psychiatrists use pharmacologic, psychotherapeutic, and/or interventional approaches to treat mental disorders. Subspecialties The field of psychiatry has many subspecialties that require additional (fellowship) training which are certified by the American Board of Psychiatry and Neurology (ABPN) and require Maintenance of Certification Program to continue. These include the following: Clinical neurophysiology Forensic psychiatry Addiction psychiatry Child and adolescent psychiatry Geriatric psychiatry Palliative care Pain management Consultation-liaison psychiatry Sleep medicine Brain injury medicine Further, other specialties that exist include: Cross-cultural psychiatry Emergency psychiatry Learning disability Neurodevelopmental disorder Cognition diseases, as in various forms of dementia Biological psychiatry Community psychiatry Global mental health Military psychiatry Social psychiatry Sports psychiatry The United Council for Neurologic Subspecialties in the United States offers certification and fellowship program accreditation in the subspecialties of behavioral neurology and neuropsychiatry, which is open to both neurologists and psychiatrists. Some psychiatrists specialize in helping certain age groups. Pediatric psychiatry is the area of the profession working with children in addressing psychological problems. Psychiatrists specializing in geriatric psychiatry work with the elderly and are called geriatric psychiatrists or geropsychiatrists. Those who practice psychiatry in the workplace are called occupational psychiatrists in the United States and occupational psychology is the name used for the most similar discipline in the UK. Psychiatrists working in the courtroom and reporting to the judge and jury, in both criminal and civil court cases, are called forensic psychiatrists, who also treat mentally disordered offenders and other patients whose condition is such that they have to be treated in secure units. Other psychiatrists may also specialize in psychopharmacology, psychotherapy, psychiatric genetics, neuroimaging, dementia-related disorders such as Alzheimer's disease, attention deficit hyperactivity disorder, sleep medicine, pain