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 hours accurately describes the oliguric phase of acute kidney injury (AKI). During this phase, there is a marked decrease in urine production due to impaired glomerular filtration. As a result, waste products accumulate, and the client develops azotemia, fluid retention, and electrolyte imbalances such as hyperkalemia and metabolic acidosis. B. Renal function is reestablished during the recovery phase, not the oliguric phase. In the oliguric stage, renal function is severely impaired. C. The glomerular filtration rate (GFR) recovers during the diuretic and recovery phases, when kidney function begins to improve. In the oliguric phase, the GFR is significantly reduced. D. BUN and creatinine levels decrease as the kidneys recover and excrete waste normally again. In the oliguric phase, however, both BUN and creatinine levels increase due to decreased renal clearance.