A 27-year-old woman is seen in a clinic to get tested for HIV. She is in a relationship with a man who has HIV. Her partner with HIV has not consistently taken antiretroviral therapy for several years, and he recently had an HIV RNA level of 68,200 copies/mL. They have sex frequently and usually use condoms. She estimates they have had condomless vaginal sex five or six times in the last 9 months, with the most recent condomless sex taking place about 5 weeks ago. She is not pregnant. A laboratory-based HIV-1/2 antigen-antibody immunoassay is ordered.