professional. I am a child. You may use this test if you have suspicions about whether or not you show signs of BPD, but please don't use it as a self-diagnostic tool. Doing your own research is incredibly important, and, if possible, I'd advise speaking to a professional if you have serious concerns. According to the DSM-5-TR, Borderline Personality Disorder (BPD) is a cluster B personality disorder characterized by "a pervasive pattern of instability of interpersonal relationships, self-image, and affects, and marked impulsivity, beginning by early adulthood and present in a variety of contexts."