Oliguria
Oliguria is the passage of less than 400 mL of urine in 24 hours. Anuria is failure to pass any urine.
History
Renal circulatory insufficiency
There will usually be a recent history of a condition which causes renal hypoperfusion. This may include haemorrhage, burns or dehydration, e.g. from vomiting, diarrhoea or acute pancreatitis.
Renal causes
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