A patient in the intensive care unit is reported to be in the oliguric phase of intrinsic renal failure. What assessment finding supports this clinical determination?

Question

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1. The oliguric phase may last 10 to 14 days, during which the patient excretes less then 400 mL of urine/day.
2. The onset phase immediately follows the renal injury and lasts 2-4 days. The urine output is reduced by 20%, and the BUN and creatinine may begin to increase slightly.
3. As a patient begins to regain renal function, the diuretic phase of intrinsic renal failure begins and urine output often increases up to 5 liters of urine each day.
4. The final phase of intrinsic renal failure is the recovery phase, which typically lasts from 6 months to a year. During this phase, most patients' renal function and lab values slowly return to normal.

A Patient in the Intensive Care Unit Is Reported to Be