Anuria is defined as urine output less than _______ ml/24 hours.

Correct option is C

Sol. Anuria is defined as urine output less than 100 ml per 24 hours, indicating serious renal dysfunction or failure. Explanation of each option:
· (a) 800 ml – Incorrect. 800 ml is within the normal or slightly low range for urine output. It is not indicative of anuria, which is a complete absence or near absence of urine output.
· (b) 500 ml – Incorrect. 500 ml may suggest oliguria (a condition where urine output is less than normal but more than anuria). It is not considered diagnostic for anuria.
· (c) 100 ml – Correct. 100 ml of urine output in 24 hours is diagnostic for anuria, which is defined as a severe reduction or absence of urine production, usually due to kidney failure or severe dehydration.
· (d) 300 ml – Incorrect. 300 ml is a moderate reduction in urine output, typically indicative of oliguria, but it does not meet the threshold for diagnosing anuria.