A nurse is teaching a client who has acute kidney injury about the oliguric phase. Which of the following information should the nurse include in the teaching?

Rationale: A. Urine output is less than 400 mL per 24 hr is correct because the oliguric phase of acute kidney injury (AKI) is characterized by a significant reduction in urine output, typically less than 400 mL per day. During this phase, waste products accumulate, fluid retention occurs, and electrolyte imbalances develop. This phase usually lasts 7–14 days but can vary depending on the cause of AKI. B. The glomerular filtration rate (GFR) recovers is incorrect because during the oliguric phase, GFR is actually decreased. Recovery of GFR occurs later, during the diuretic and recovery phases of AKI. C. Renal function is reestablished is incorrect because kidney function remains impaired during the oliguric phase. Reestablishment of renal function occurs in the recovery phase after the kidneys begin producing urine adequately. D. BUN and creatinine levels decrease is incorrect because these waste products increase during the oliguric phase due to reduced filtration. Elevated BUN and creatinine are key markers of impaired kidney function during this stage.