ANATOMY

Detailed explanation-1: -Oliguria is a medical term for low urine output (how much you pee). In the case of an adult, this means less than 400 milliliters (mL) to 500 mL (around two cups) of urine per 24 hours. The numbers depend on weight in terms of children and infants.

Detailed explanation-2: -Oliguria is defined as urinary output less than 400 ml per day or less than 20 ml per hour and is one of the earliest signs of impaired renal function.[1] It had been described early in the literature when Hippocrates identified the prognostic importance of the urinary output.

Detailed explanation-3: -Oliguria or hypouresis is the low output of urine specifically more than 80 ml/day but less than 400ml/day.

Detailed explanation-4: -Common causes include: Dehydration from not drinking enough fluids and having vomiting, diarrhea, or fever. Total urinary tract blockage, such as from an enlarged prostate. Medicines such as anticholinergics and some antibiotics.

Detailed explanation-5: -Oliguria occurs when the urine output in an infant is less than 0.5 mL/kg per hour for 24 hours or is less than 500 mL/1.73 m2 per day in older children. Anuria is defined as absence of any urine output. An important point to remember is that healthy newborns may have no urine output for 24 hours after birth.