Definition
- Oliguria is decreased urine output.
- Infants: < 0.5 mL/kg per hour for 24 hours
- Older children: < 500 mL/1.73 m2 body surface area per day
- Anuria is absence of any urine output.
- Normal, healthy newborns may have no urine output for 24 hours after birth.
- Oliguria is much more common than anuria but can lead to anuria, resulting in serious renal damage that requires specialized care.
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