Low urine output

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What is the definition of oliguria?
<20mL/hr or <400mL/day
What are the two most common causes of low urine output in an inpatient?
Blocked catheter and dehydration
A restless patient with abdominal discomfort, agitation and sensation of needing to pass urine suggests what diagnosis?
Acute urinary retention
What Ur:Cr indicates pre-renal failure?
>100
What Ur:Cr indicates intra-renal renal failure?
<40
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