Decreased urination

Also Known As: Decreased urination, Oliguria, Hypouresis, Decreased urinary output

Oliguria or hypouresis (both names from roots meaning "not enough urine") is the low output of urine.[1] In humans, it is clinically classified as an output more than 100 ml/day but less than 400ml/day.[2] The decreased output of urine may be a sign of dehydration, renal failure, hypovolemic shock, HHNShyperosmolar Hyperglycemic Nonketotic Syndrome, multiple organ dysfunction syndrome, urinary obstruction/urinary retention, DKA, pre-eclampsia, and urinary tract infections, among other conditions.

The most extreme type of Oliguria is called anuria, which represents an absence of urine, clinically classified as below 50ml/day.[2]

Oliguria is defined as a urine output that is less than 1 mL/kg/h in infants,[3] less than 0.5 mL/kg/h in children,[3] and less than 400 mL[3] or 500 mL[4] per 24h in adults - this equals 17 or 21 mL/hour. For example, in an adult weighing 70 kg it equals 0.24 or 0.3 ml/hour/kg. Alternatively, however, the value of 0.5 mL/kg/h is commonly used to define oliguria in adults as well.[4]

Olig- (or oligo-) is a Greek prefix meaning small or few.[5]

Anuria is defined as less than 50mL urine output per day.

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