A patient in the intensive care unit is reported to be in the oliguric phase of intrinsic renal failure, which is reflected by:
1. Urine output of less then 400 mL/day
2. BUN and creatinine that may begin to increase slightly
3. Urinary output of up to 5 liters of urine each day
4. Abnormal laboratory values that can last from 6 months to a year in duration
1
Rationale 1: The oliguric phase may last 10 to 14 days during which the patient excretes less then 400 mL of urine/day.
Rationale 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.
Rationale 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.
Rationale 4: The final phase of intrinsic renal failure is the recovery phase that typically lasts from 6 months to a year. During this phase, most patients' renal function and lab values slowly return to normal.
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