The amount of blood filtered in renal capsule per minute is called?

VSSC Nursing Officer - 2021

Applied Physiology

Easy

Appeared in: VSSC Nursing Officer - 2021

Explanation

The Glomerular Filtration Rate (GFR) is the precise term for the volume of fluid filtered from the glomerular capillaries into the Bowman's capsule per unit of time.
In a healthy adult, this rate is approximately 125 mL/minute or 180 Liters/day.
GFR is the most crucial and widely used indicator for assessing renal excretory function.
Urine formation begins with this filtration process, where a large amount of fluid, free of proteins and cells, passes from the blood into the nephron.

Option A: 'Glomerular capacity' is not a standard physiological term used to describe the rate of filtration. It is a vague term with no defined meaning in renal physiology.
Option C: 'Glomerular gradient' refers to the pressure differences (hydrostatic and oncotic) across the glomerular membrane that drive the process of filtration. It is the cause of filtration, not the measure of the filtration rate itself.
Option D: 'Glomerular reserve' or 'renal functional reserve' refers to the kidney's ability to increase its GFR above a baseline level in response to physiological or pathological stimuli. It is a measure of functional capacity, not the baseline rate of filtration.

Clinical Relevance

Nursing practice connection: Knowing Definition of Glomerular Filtration Rate (GFR) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Monitoring GFR is essential for diagnosing, staging, and managing chronic kidney disease (CKD). It helps clinicians make decisions about medication dosing, particularly for drugs cleared by the kidneys.
A sudden drop in GFR can indicate Acute Kidney Injury (AKI), a medical emergency requiring prompt intervention to prevent permanent kidney damage.
What if a patient with diabetes shows a persistently low GFR? This would indicate diabetic nephropathy, a common complication of diabetes. The nurse's role would be to educate the patient on tight glycemic control, blood pressure management, and dietary modifications (like protein restriction) to slow the progression of kidney damage.

How to Approach the Question

First, read the question carefully to identify the core concept being asked. The keywords are 'amount of blood filtered', 'renal capsule', and 'per minute'.
Recognize that this is a definition-based question from renal physiology.
Analyze the options. 'Rate' is a key component of the question ('per minute'), which strongly points towards 'Glomerular filtration rate'.
Evaluate the other options: 'capacity', 'gradient', and 'reserve' do not fit the definition of a volume filtered over time.
Confirm the definition of GFR from your knowledge base. It is the volume of filtrate formed per unit of time.
Select 'Glomerular filtration rate' as the most accurate and standard term.

Concept Tested & Keywords

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