Urine output less than 100 ml is termed as?

Appeared in: NIA - 29 January 2023

Explanation

Anuria is the correct medical term for a urine output of less than 100 mL in a 24-hour period.
This extremely low volume indicates that the kidneys are no longer producing a significant amount of urine.
It is a critical sign of severe renal impairment, such as acute kidney injury (AKI), end-stage renal disease (ESRD), or a complete urinary tract obstruction.

Option B: Oliguria refers to a low urine output, but the threshold is higher than that for anuria. It is typically defined as a urine output between 100 and 400 mL per 24 hours.
Option C: Enuresis describes the act of involuntary urination (e.g., bedwetting). It is a problem of bladder control, not urine production volume.
Option D: Micturition is the physiological term for the process of urinating or voiding. It describes the action, not the quantity of urine produced.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Terminology for abnormal urine output volumes as background academic context rather than a clinical decision trigger.
Accurate measurement and documentation of urine output are fundamental nursing responsibilities. It is a key indicator of a patient's fluid status and renal function.
Anuria is a medical emergency. Nurses must promptly report this finding to the healthcare provider as it may indicate severe conditions like shock, sepsis, or complete urinary obstruction requiring urgent intervention.
What if? If a patient's urine output was 500 mL in 24 hours, this would be considered low but not oliguric by most definitions (which often use <400 mL or <500 mL). The nurse should still assess for signs of dehydration or decreased renal perfusion but the situation is less critical than oliguria or anuria.

How to Approach the Question

First, identify the key information in the question: 'urine output less than 100 ml'.
This is a definition-based question. Your task is to recall the correct medical terminology for different levels of urine output.
Define each option: Anuria (very low/no output), Oliguria (low output), Enuresis (involuntary urination), and Micturition (act of urination).
Compare the value given in the question (less than 100 ml) with the standard definitions.
The definition of Anuria (less than 100 mL/day) directly matches the question's parameter.
Select Anuria as the correct answer because it is the specific term for this critically low urine volume.

Concept Tested & Keywords

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

E6 Nursing Brunner Adult Health 3SA Vol 2 Part 1 p. 128-130

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