If someone has symptoms, a doctor may use various tests -- such as brain imaging (like MRI scans) or blood tests -- to rule out a nonpsychiatric illness. If the doctor finds no physical reason for the symptoms, he or she may refer the person to a psychiatrist or psychologist, mental health professionals who are trained to diagnose and treat mental illnesses. They use specially designed interview and assessment tools to see if someone has a psychotic disorder. For a diagnosis of schizophreniform disorder, the