Production of less than 50 ml/day of urine is known as :

Appeared in: IGNOU PB Bsc Entrance-2023

Explanation

Anuria is clinically defined as urine output of less than 50-100 mL per 24 hours.
This condition represents a near-total failure of the kidneys to produce urine.
It is a critical sign indicating severe renal dysfunction, such as end-stage renal disease, severe acute kidney injury, or complete urinary tract obstruction.

Option A: Normal urine output for a healthy adult is significantly higher, typically ranging from 800 to 2000 mL per day.
Option B: Polyuria is the opposite condition, characterized by excessive urine production, typically defined as more than 2.5 to 3 liters (2500-3000 mL) per day.
Option C: Oliguria refers to a low urine output, specifically less than 400 mL per day. While it is a serious condition, it is not as severe as anuria.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Terminology of Urine Output as background academic context rather than a clinical decision trigger.
Recognizing the difference between oliguria and anuria is critical for nurses, as anuria signifies a more urgent medical emergency requiring immediate intervention, often including preparation for dialysis.
A key nursing action for a patient with sudden anuria is to perform a bladder scan to rule out a simple obstruction (like a blocked catheter) as the cause before escalating to more complex diagnostic workups.
What if the urine output was 350 mL/day? This would be classified as oliguria, not anuria. While still a serious sign of acute kidney injury, it indicates some remaining kidney function, and the immediate management might focus more on fluid challenges and identifying the pre-renal, intra-renal, or post-renal cause, whereas anuria often points directly to the need for renal replacement therapy.

How to Approach the Question

First, identify the key information in the question: 'less than 50 ml/day of urine'. This is a specific quantitative value.
Next, recall the standard medical definitions for different levels of urine output.
Evaluate each option against the value given in the question.
Option A ('normal') is incorrect as normal output is much higher.
Option B ('polyuria') is incorrect as it means excessive urine.
Option C ('oliguria') means low urine output, but the threshold is higher (less than 400 mL/day).

Concept Tested & Keywords

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E6 Medicine Davidson Principles Practice 24e p. 411-413

E6 Medicine Harrison 22e Part 2 p. 284-286

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