Diagnosis

Personality disorders, including borderline personality disorder, are diagnosed based on a:

• Detailed interview with your doctor or mental health provider
• Psychological evaluation that may include completing questionnaires
• Medical history and exam
• Discussion of your signs and symptoms

A diagnosis of borderline personality disorder is usually made in adults, not in children or teenagers. That's because what appear to be signs and symptoms of borderline personality disorder may go away as children get older and become more mature.