How is dissociative identity disorder (DID) diagnosed?

If symptoms are present, an evaluation will be done with a complete medical history and physical examination. Although no laboratory tests can 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).

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