There has been some confusion around this topic, even among professionals; since the Complex PTSD diagnosis has been established, they have found that some persons who have been diagnosed with borderline may better fit the construct of CPTSD; however, it is not correct to suggest that they are identical or interchangeable. Here's a recent study that worked towards more precisely identifying the divide:
Distinguishing PTSD, Complex PTSD, and Borderline Personality Disorder: A latent class analysis
Quote:
Findings supported the construct validity of Complex PTSD as distinguishable from BPD. Key symptoms that distinguished between the disorders were identified, which may aid in differential diagnosis and treatment planning.
Four BPD symptoms were found to greatly increase the odds of being in the BPD compared to the Complex PTSD class: frantic efforts to avoid abandonment, unstable sense of self, unstable and intense interpersonal relationships, and impulsiveness.
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