<unk>  and anuria are the decreased or absent production of urine, respectively.<unk>  is defined as a urine output that is less than 1 mL/kg/h in infants, less than 0.5 mL/kg/h in children, and less than 400 mL or 500 mL 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<unk>  in adults as well.
Olig- (or oligo-) is a Greek prefix meaning small or few.
Anuria is defined as less than 50mL urine output per day.
Oliguria
Anuria
Polyuria
Dysuria
Crystalluria
Pyuria
Nocturia
Urinary urgency