Which client in severe pain should be evaluated first for possible infection?

The client with the painful hip and limited motion should be evaluated first for possible infection because these symptoms can suggest a serious underlying condition such as septic arthritis or osteomyelitis, particularly if assessed in the context of other signs like fever or systemic illness.

Infections in the bones and joints can develop rapidly and lead to significant morbidity if not treated promptly. The hip joint is particularly vulnerable in adolescents, as growth and development can create changes in bone and joint structure that make infections more likely or more severe.

While other options present concerning symptoms (such as fever and burning during urination, which could indicate a urinary tract infection), the combination of hip pain and limited motion in a 15-year-old raises the suspicion of a potentially life-altering condition that necessitates immediate attention. Rapid assessment and intervention can prevent complications and promote better outcomes in suspected infections. Therefore, prioritizing the evaluation of this client aligns with the urgency of managing possible severe infections.