A nurse is caring for a client with acquired immunodeficiency syndrome (AIDS) who has a CD4+ T cell count of 150 cells/mm³. Which nursing intervention should be the highest priority to ensure client safety?

When a client with AIDS has a CD4+ T cell count of 150 cells/mm³, the immune system is severely compromised. A count below 200 cells/mm³ defines the transition from HIV to AIDS and indicates a high risk for opportunistic infections. In NCLEX-RN priority questions, physiological safety and infection prevention take precedence based on Maslow's hierarchy of needs. The systematic review by Tchouaket et al. highlights that vulnerable populations in care settings face heightened risks of contracting healthcare-associated infections (HCAIs), and that these infections are largely preventable through strict infection prevention and control (IPC) clinical best practices ^[1]. Therefore, the nurse's immediate priority is to protect the client from environmental pathogens.

Implementing strict infection control precautions and protective isolation measures (Option 2) directly addresses the most immediate threat to life: acquiring a new infection that the client's immune system cannot fight. The evidence underscores that environments with close living conditions and frequent staff-resident interactions are high-risk for HCAIs, and that IPC measures are critical for ensuring safety and improving health outcomes ^[1]. For a client with a CD4 count of 150 cells/mm³, protective isolation (reverse isolation) creates a barrier against exogenous pathogens, which is the most direct safety intervention.

While administering antiretroviral therapy (Option 1) is essential for long-term immune reconstitution, it does not provide immediate protection against environmental pathogens. Medication timing, though important, is a lower priority than establishing a safe physical environment. Providing nutritional counseling (Option 3) addresses a psychosocial and long-term physiological need, which ranks lower on the hierarchy than immediate safety. Monitoring vital signs (Option 4) is a form of assessment and secondary prevention; it helps detect infection early but does not prevent it. In the NCLEX-RN framework, an intervention that actively prevents a life-threatening event takes priority over monitoring or health promotion activities.