Differences in HIV testing among sexual orientation subgroups in the United States: A national cross-sectional study.

Understanding differences in HIV testing among US adults is a crucial step for HIV prevention. This study used cross-sectional data to assess whether HIV testing varies across sexual orientation subgroups and by important psychosocial factors. Data were from the National Epidemiological Survey on Alcohol and Related Conditions-III (NESARC-III; n = 36 309, response rate = 60.1%), a nationally representative survey of the US non-institutionalized adult population. Using logistic regression, we examined HIV testing among heterosexual concordant, heterosexual discordant, gay/lesbian, and bisexual adults. Psychosocial correlates included adverse childhood experiences (ACEs), discrimination, educational attainment, social support, and substance use disorders (SUDs). Bisexual (77.0%) and gay/lesbian (65.4%) women had a greater prevalence of HIV testing than concordant heterosexual women (51.6%), and bisexual women had a significantly higher testing prevalence than discordant heterosexual women (54.8%). Gay (84.0%) and bisexual (72.1%) men also had a significantly higher testing prevalence than discordant (48.2%) and concordant (49.4%) heterosexual men. In multivariable models, bisexual men and women (AOR = 1.8; 95% CI = 1.3-2.4) and gay men (AOR = 4.7; 95% CI = 3.2-7.1) had significantly greater odds of HIV testing than heterosexual concordant adults. A higher number of ACEs, greater social support, history of SUDs, and higher educational attainment were positively associated with HIV testing. HIV testing prevalence varied across sexual orientation subgroups; discordant heterosexual men had the lowest prevalence. Health care providers should consider a person's sexual orientation, ACEs, educational attainment, social support, and history of SUDs when evaluating HIV testing needs in the US.