The main difference between Oliguria and Anuria is that the Oliguria is a low output of urine and Anuria is a Human disease.
Oliguria or hypouresis (both names from roots meaning “not enough urine”) is the low output of urine. In humans, it is clinically classified as an output more than 80 ml/day but less than 400ml/day. The decreased output of urine may be a sign of dehydration, kidney failure, hypovolemic shock, HHNS hyperosmolar Hyperglycemic Nonketotic Syndrome, multiple organ dysfunction syndrome, urinary obstruction/urinary retention, DKA, pre-eclampsia, and urinary tract infections, among other conditions.
Beyond oliguria is anuria, which represents an absence of urine, clinically classified as below 80 or 100 ml/day.
Anuria, sometimes called anuresis, is nonpassage of urine, in practice is defined as passage of less than 100 milliliters of urine in a day. Anuria is often caused by failure in the function of kidneys. It may also occur because of some severe obstruction like kidney stones or tumours. It may occur with end stage renal disease. It is a more extreme reduction than oliguria (hypouresis), with 100 mL/day being the conventional (albeit slightly arbitrary) cutoff point between the two.
A decreased production in the volume of urine.
A condition in which the kidneys do not produce urine.
the production of abnormally small amounts of urine.
failure of the kidneys to produce urine.