Findings support the use of the Personality Inventory for DSM-5 (PID-5) algorithm for differentiating bipolar disorder (BD) from borderline personality disorder (BPD). Furthermore, there findings support the accuracy of the DSM-5 alternative model Criteria B trait constellation for differentiating these 2 disorders with overlapping features. Receiver operator characteristics and diagnostic efficiency statistics were calculated to ascertain the relative diagnostic efficiency of self-report measures. Inpatients with research-confirmed diagnoses of BD (n=341) or BPD (n=381) completed the Difficulty in Emotion Regulation Scale (DERS) and PID-5. Researchers found:
- The total score for DERS evidenced relatively poor accuracy for differentiating the disorders, while subscales of affective instability measures yielded fair discrimination.
- The PID-5 BPD algorithm (consisting of emotional lability, anxiousness, separation insecurity, hostility, depressivity, impulsivity, and risk taking) evidenced moderate-to-excellent accuracy with a good balance of specificity and sensitivity.
Fowler JC, Madan A, Allen JG, Oldham JM, Frueh BC. Differentiating bipolar disorder from borderline personality disorder: Diagnostic accuracy of the difficulty in emotion regulation scale and personality inventory for DSM-5. [Published online ahead of print November 13, 2018]. J Affect Disord. doi:10.1016/j.jad.2018.11.079.