The most frequently researched aspect of the relationship between BPD and bipolar disorder has been the frequency of their co-occurrence. Several reviews have estimated a 20% overlap in diagnostic frequency.
Standardized, quantifiable outcome measures exist for most major psychiatric disorders, yet they are rarely used in routine clinical practice. This article identifies the rationale for using psychiatric scales.
Recent research has raised concerns about the adequacy of psychiatric diagnostic evaluations conducted in routine clinical practice, particularly the detection of disorders that are comorbid to the principal diagnosis.