Anuria is defined as urine output less than ?
**Core Concept**
Anuria is a medical condition characterized by the inability to produce urine, which can occur due to various reasons such as renal failure, obstruction of the urinary tract, or severe dehydration. The kidneys are responsible for filtering waste products from the blood and producing urine, but in anuric patients, this process is severely impaired.
**Why the Correct Answer is Right**
Anuria is typically defined as a urine output of less than 50 mL per 24 hours. This is because the kidneys are unable to concentrate or dilute the urine effectively, resulting in a very low urine output. The kidneys' ability to concentrate or dilute the urine is crucial in maintaining proper fluid balance and electrolyte homeostasis in the body. In anuric patients, the kidneys fail to perform this function, leading to severe fluid overload and electrolyte imbalances.
**Why Each Wrong Option is Incorrect**
**Option A:** 100 mL per 24 hours is still considered oliguria, not anuria. Oliguria is a condition characterized by a decreased urine output, but it is not as severe as anuria.
**Option B:** 200 mL per 24 hours is still within the normal range of urine output, which is typically 800-2000 mL per 24 hours.
**Option C:** 10 mL per 24 hours is an extremely low urine output, but it is not the generally accepted definition of anuria.
**Clinical Pearl / High-Yield Fact**
Remember that anuria can be a life-threatening condition if left untreated, as it can lead to severe fluid overload, electrolyte imbalances, and even renal failure. It is essential to identify the underlying cause of anuria and initiate appropriate treatment promptly.
**Correct Answer: C. 50 mL per 24 hours**