Sexual- and gender-minority (SGM) individuals are diagnosed with borderline personality disorder (BPD) more than cisgender heterosexuals. Using a large sample of mental-health practitioners in the United States and Canada (N = 426), we examined bias in the diagnosis of BPD. Mental-health practitioners were randomly assigned to receive one of three clinical vignettes (cisgender heterosexual man, cisgender gay man, or transgender woman) and asked to provide psychiatric diagnoses based on the vignette. Mental-health practitioners demonstrated a predilection to diagnose BPD when presented with the transgender vignette (odds ratio [OR] = 1.99, p = .01) but not the cisgender-gay vignette (OR = 1.34, p = .29) compared with practitioners presented the cisgender-heterosexual vignette. Psychiatrists, mental-health counselors, and clinical social workers were significantly more inclined to diagnose BPD than psychologists, although reasons for underdiagnosis differed across groups. These findings bear important implications for future training given the nature of the mental-health workforce in the United States.
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