You can get tested for borderline personality disorder (BPD) through a psychiatrist, psychologist, or licensed clinical social worker who has experience with personality disorders. The most common starting points are your primary care doctor (who can refer you to a specialist), a community mental health center, a university psychology training clinic, or a telehealth platform that offers diagnostic evaluations. There’s no single blood test or brain scan for BPD. Diagnosis relies on a structured clinical interview, usually over one or more sessions.
Who Can Diagnose BPD
Three types of licensed mental health professionals are qualified to formally diagnose BPD: psychiatrists, psychologists, and licensed clinical social workers. Not every therapist or counselor has the training to evaluate personality disorders specifically, so you want someone with experience in this area. A general therapist you’re already seeing may suspect BPD, but they’ll often refer you to a specialist for a formal assessment.
Your primary care doctor is a useful first stop. BPD is commonly encountered in primary care settings, and your doctor can rule out medical conditions or substance use that might explain your symptoms, then refer you to a mental health specialist. Primary care providers can also connect you with local dialectical behavior therapy (DBT) groups or integrated behavioral health services if those are available in your area.
Where to Find Testing
Several types of facilities offer BPD evaluations, and cost and wait times vary significantly between them.
- Private psychiatrists or psychologists: The most direct route. Search for providers who list personality disorders as a specialty. Expect to pay out of pocket if your insurance doesn’t cover psychological testing, which can range from a few hundred to over a thousand dollars depending on how comprehensive the evaluation is.
- Community mental health centers: These publicly funded clinics offer mental health services on a sliding fee scale based on income. Most counties have at least one, and they can either conduct evaluations or refer you to someone who can.
- University psychology training clinics: Graduate programs in clinical psychology often run clinics open to the public. Because trainees are building their skills under supervision, these clinics tend to provide unusually thorough evaluations at reduced cost. Fees are typically on a sliding scale based on family income. The trade-off is longer wait times and evaluations that may take more sessions, since they’re also serving as training opportunities.
- Specialized BPD resource centers: NewYork-Presbyterian, for example, maintains a national database of psychiatrists, psychologists, social workers, and treatment programs with BPD expertise. Searching their directory can help you find someone in your area who specifically understands personality disorders.
- Telehealth platforms: Remote evaluations for BPD are increasingly available and appear to be effective. Research on telehealth psychotherapy for personality disorders shows high client acceptability and effectiveness ratings, and one study found outcomes comparable to in-person treatment for BPD patients. You’ll need a private space, a stable internet connection, and a device with a working camera, since the clinician needs to read your facial expressions and body language.
What the Evaluation Involves
A BPD assessment centers on a structured clinical interview. The clinician asks detailed questions about your emotions, relationships, sense of identity, and behavioral patterns. They’re looking at how you function across different areas of your life and whether your difficulties form a consistent, long-standing pattern rather than a reaction to a single stressful event.
The formal diagnostic criteria require that you meet at least five out of nine specific features:
- Frantic efforts to avoid real or imagined abandonment
- A pattern of intense, unstable relationships that swing between idealizing someone and devaluing them
- A persistently unstable sense of who you are
- Impulsivity in at least two areas that could cause harm (spending, substance use, reckless driving, binge eating, risky sex)
- Recurrent self-harm or suicidal behavior
- Rapid, intense mood shifts that typically last hours rather than days
- Chronic feelings of emptiness
- Intense anger that’s hard to control
- Stress-related paranoia or dissociation (feeling detached from reality)
Clinicians use standardized interview tools to assess these criteria systematically. Some also use self-report questionnaires that ask you to rate how often you experience specific feelings or behaviors. The evaluation typically takes more than one session, especially if the clinician wants to distinguish BPD from conditions that can look similar.
Conditions That Can Look Like BPD
One reason a thorough evaluation matters is that BPD shares features with several other conditions. Bipolar disorder is the most common source of confusion, but the two differ in an important way: bipolar disorder is episodic, with distinct mood episodes separated by stretches of normal mood. BPD involves chronic, ongoing emotional instability that doesn’t come and go in discrete episodes.
ADHD is another condition that overlaps with BPD. Both involve impulsivity and difficulty regulating emotions, and both tend to be persistent rather than episodic. But certain BPD features are distinct: the fear of abandonment, chronic emptiness, self-harm, and stress-triggered paranoia or dissociation don’t occur in ADHD alone. A skilled evaluator will tease apart these differences, and it’s worth knowing that having one of these conditions doesn’t rule out also having another. They can co-occur.
BPD Diagnosis in Teenagers
BPD has traditionally been considered an adult diagnosis, and many clinicians still hesitate to diagnose it before age 18. The concern is that emotional instability and identity struggles are a normal part of adolescent development and may resolve on their own. The American Psychiatric Association’s current guidelines, however, recognize that adolescents can meet criteria for BPD and benefit from targeted treatment. Research on BPD in adolescents has included participants as young as 13, and there are validated screening tools designed specifically for younger patients, including versions that incorporate parent reports.
If you’re a teenager or the parent of a teenager seeking evaluation, look for a clinician who has specific experience with adolescent personality development. The assessment should account for what’s developmentally normal at that age versus what represents a lasting pattern.
How to Prepare for Your Evaluation
Before your appointment, it helps to reflect on your history. Think about when your emotional difficulties started, how your relationships have played out over time, and whether your patterns have been consistent across different periods of your life. The clinician will want to know that your symptoms aren’t better explained by a specific traumatic event, a medical condition, or substance use, so be prepared to discuss those areas honestly.
Bring any previous mental health records if you have them. If you’ve been in therapy before, knowing what diagnoses were considered or what treatments helped (or didn’t) gives the evaluator useful context. You don’t need to have all the answers prepared. The clinician’s job is to ask the right questions and piece the picture together with you.