ANATOMY

Detailed explanation-1: -Polyuria is a condition characterized that there is large volumes of urine (at least 3000 mL over 24 h). Many factors affect the urine volume. The 24 h urine amount of the normal person is about 1000–2000 mL. Oliguria is defined as a urine output that is less than 400 mL/24 h or less than 17 mL/h in adults.

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: -How frequent of urination is polyuria? Polyuria is not defined by the number of times you urinate, but rather the amount. Urine output in excess of 3 liters a day or more is considered polyuria.