Borderline Personality Disorder Test

This self-report measure is used to quickly quantify the severity of symptoms associated with borderline personality disorder in adults. Developed by Martin Bohus and colleagues, the Borderline Personality Disorder Test uses the Borderline Symptom List (BSL-23) to provide a brief, reliable snapshot of current symptom burden — supporting both clinical screening at intake and repeated symptom monitoring over the course of treatment. It consists of 23 items and typically takes about 5 minutes to complete.

Why Take a Borderline Personality Disorder Test

Borderline personality disorder is characterized by a complex, shifting pattern of emotional, relational, and behavioral difficulties that can vary significantly in intensity over time. This variability is one of the features that makes BPD both challenging to assess and particularly important to monitor. A static, one-time evaluation captures only a single moment in what is often a dynamic symptom picture.

The BSL-23 was designed specifically to address this challenge. Unlike a general BPD quiz focused on presence or absence of traits, this instrument measures how intensely BPD-related symptoms are currently affecting the respondent — making it equally useful as an initial BPD screening tool and as a repeated measure for tracking therapeutic progress. For individuals already in DBT or other evidence-based treatments for borderline personality disorder, regular administration of a structured symptom severity measure like this one can provide meaningful, data-based feedback on whether symptoms are improving over time.

For individuals who have not yet received a diagnosis, this test for borderline personality disorder provides a structured, evidence-based snapshot of current symptom severity — helping to clarify whether the intensity of what they are experiencing warrants further professional evaluation.

What the Assessment Measures

The BSL-23 consists of 23 items sampling core symptom domains associated with borderline personality pathology as defined in DSM-5 criteria:

• Affective instability — rapidly shifting emotional states, intense reactions to perceived slights or abandonment, difficulty returning to emotional baseline
• Identity disturbance — chronic feelings of emptiness, unstable self-image, and uncertainty about values, goals, or identity
• Impulsivity — difficulty resisting urges, self-damaging behavior, and acting without consideration of consequences
• Interpersonal difficulties — intense and unstable relationships, fear of abandonment, and difficulty maintaining stable emotional connections
• Dissociation and paranoid ideation — transient stress-related dissociative experiences or paranoid thoughts

Each item is rated on a 5-point frequency scale, yielding a mean score that reflects overall current symptom severity and can be compared against established clinical thresholds.

Who This Assessment Is For

This assessment is appropriate for any adult who suspects that BPD symptoms may be affecting their emotional regulation, relationships, or sense of self — whether seeking an initial understanding of their symptoms or monitoring progress during treatment. It is particularly relevant for individuals asking "do I have BPD?" or those already in therapy who want a structured BPD self test to track their progress between sessions.

It is also widely used by clinicians and mental health trainees as a quick, validated BPD screening tool to support intake assessment and treatment planning.

Clinical Validity and Use in Practice

The BSL-23 has been validated in multiple peer-reviewed studies and demonstrates strong psychometric properties including high internal consistency and sensitivity to therapeutic change over time. Results from this Borderline Personality Disorder Test are intended to complement — not replace — a comprehensive diagnostic evaluation. They should always be interpreted by a qualified clinician alongside clinical interview and other relevant assessment data. Elevated scores indicate that BPD-related symptom burden is currently significant and that professional support may be beneficial.