An older adult client who resides in a long-term care facility is incontinent of urine and has a stage II pressure injury on the left heel. When the client becomes confused, which assessment is most important for the nurse to obtain?

Choice A reason: Urinary output for the past six hours is useful for monitoring renal function and hydration status, but confusion in an older adult with incontinence and a pressure injury raises concern for infection. While urine output is relevant, it is not the most immediate priority compared to systemic infection assessment. Choice B reason: Assessing serous drainage from the heel wound provides information about local healing, but confusion is more likely related to systemic infection or sepsis rather than localized wound drainage. This assessment does not directly explain the acute mental status change. Choice C reason: White blood cell count is the most important assessment because confusion in older adults is often an early sign of infection, such as urinary tract infection or wound infection. Elevated WBC would confirm systemic infection, which requires urgent intervention. This is the priority because untreated infection can rapidly progress to sepsis. Choice D reason: Reviewing the 24-hour medication history is helpful for identifying drug-induced confusion, but infection is more common and urgent in this scenario. While medication effects should be considered, ruling out infection through WBC assessment is the immediate priority.