Anuria means?

Appeared in: KPSC Staff Nurse - 2017

Explanation

Anuria is clinically defined as a urine output of less than 100 mL in a 24-hour period.
This condition indicates severe renal dysfunction, such as acute kidney injury or complete urinary tract obstruction, and is considered a medical emergency.
The threshold of less than 100 mL/day is the standard used to differentiate anuria from oliguria (which is defined as less than 400 mL/day).

Option B: While some sources may use a stricter definition of less than 50 mL/day, the most widely accepted clinical standard for anuria is less than 100 mL/day.
Option C: A urine output of less than 10 mL/day is not the standard clinical definition for anuria and represents an extremely low, non-standard threshold.
Option D: While 'anuria' literally means 'no urine,' the clinical definition uses a quantitative threshold. It is possible for a patient to produce a very small amount of urine and still be considered anuric.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Anuria and related urine output terminology as background academic context rather than a clinical decision trigger.
Recognizing anuria is a critical nursing responsibility as it signals a medical emergency, often due to acute kidney injury (AKI), shock, or complete urinary tract obstruction.
A nurse's first action upon suspecting anuria is to perform a bladder scan to rule out retention and then urgently notify the provider, as prompt intervention is key to preventing permanent kidney damage.
What if? If the patient's output was 350 mL in 24 hours, the condition would be classified as oliguria, not anuria. While still a serious finding requiring investigation, it is less severe than anuria.

How to Approach the Question

First, identify the core of the question, which is asking for the specific clinical definition of 'anuria'.
Recall the standard quantitative definitions for altered urine output. Remember that medical terms often have precise numerical values associated with them for diagnosis.
Compare the given options to the standard definitions. Normal output is approximately 800-2000 mL/day, oliguria is less than 400 mL/day, and anuria is less than 100 mL/day.
Eliminate options that are incorrect. 'No formation of urine' is a literal but not clinical definition. Less than 50 mL and less than 10 mL are not the standard thresholds.
Select the option that matches the most widely accepted clinical definition, which is less than 100 mL in 24 hours.

Concept Tested & Keywords

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

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