How is paranoid personality disorder diagnosed?

If a person has symptoms, the doctor will begin an evaluation by performing a complete medical history and physical examination. Although there are no laboratory tests to specifically diagnose personality disorders, the doctor might use various diagnostic tests to rule out physical illness as the cause of the symptoms. For example, difficulty hearing or long-lasting substance abuse may be confused with PPD.

If the doctor finds no physical reason for the symptoms, he or she might refer the person to a psychiatrist or psychologist, health care professionals who are specially trained to diagnose and treat mental illnesses. PPD is different from psychotic disorders such as schizophrenia, paranoid type or delusional disorder, persecutory type, in that the person with PPD lacks the perceptual distortions (for example, hearing voices) or bizarre delusional thinking (for example, being followed everywhere by the FBI). Psychiatrists and psychologists use specially designed interview and assessment tools to evaluate a person for a personality disorder.

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