How is depersonalization/derealization disorder diagnosed?
If symptoms are present, an evaluation will be done with a complete medical history and physical examination. Although no laboratory tests diagnose dissociative disorders medically, various diagnostic tests such as blood tests or imaging (X-rays, CT scans, or MRIs) may be used to rule out physical illness or medication side effects.
If no physical illness is found, the person might be referred to a mental health professional, such as a psychiatrist, psychologist, or psychiatric social worker, who is specially trained to diagnose and treat mental illnesses. They will perform a clinical interview to get a full picture of the person’s past experiences and current functioning. Some psychiatrists and psychologists may employ specialized tests (for example, the Dissociative Experiences Scale—DES) or a standard interview such as the Structured Clinical Interview for Dissociation (SCID-D).