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Related Concept Videos

Renal Drug Excretion: Glomerular Filtration01:02

Renal Drug Excretion: Glomerular Filtration

248
The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production occurs. A nephron has two main components: a renal corpuscle and a renal tubule.
Drugs gain access to the kidney via the renal artery, which progressively branches off into afferent arterioles....
248
Renal Clearance01:23

Renal Clearance

887
The glomerular filtration rate (GFR) is a critical marker of kidney function, reflecting the efficiency of filtration by the glomeruli. Renal clearance of specific substances, such as inulin or creatinine, is commonly used to measure GFR.
Renal clearance refers to the volume of plasma cleared of a specific substance, such as creatinine, per unit of time. To measure clearance, urine samples are collected over a 24-hour period during each bladder voiding, followed by a single blood sample at the...
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Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
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Glomerular Filtration: Net Filtration Pressure01:26

Glomerular Filtration: Net Filtration Pressure

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Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal...
2.2K
Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

81
Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
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Glomerular Filtration01:15

Glomerular Filtration

1.3K
The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
Components of the Filtration Membrane
The filtration process involves three key layers: the glomerular endothelial cells, the basement membrane, and the podocyte-formed filtration slits.
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Related Experiment Video

Updated: Jun 23, 2025

Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat
06:58

Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat

Published on: July 26, 2015

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[Estimating glomerular filtration rate].

Marc G Vervloet1,2, Yvo M Smulders3

  • 1Radboudumc, afd. Nierziekten, Nijmegen.

Nederlands Tijdschrift Voor Geneeskunde
|June 18, 2024
PubMed
Summary
This summary is machine-generated.

Estimated glomerular filtration rate (eGFR) reporting using plasma creatinine has limitations. A new race-independent formula offers potential improvements for chronic kidney disease recognition.

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Area of Science:

  • Nephrology
  • Clinical Chemistry

Background:

  • Laboratories in The Netherlands routinely report estimated glomerular filtration rate (eGFR) using plasma creatinine.
  • Current eGFR formulas rely on gender, age, plasma creatinine, and sometimes race correction factors.

Purpose of the Study:

  • To discuss the strengths and limitations of plasma creatinine-based eGFR formulas.
  • To introduce a novel race-independent eGFR formula.

Main Methods:

  • Review of existing plasma creatinine-based eGFR formulas.
  • Discussion of a recently proposed novel eGFR formula.

Main Results:

  • Plasma creatinine-based eGFR formulas have inherent limitations.
  • A new formula eliminates the need for race correction.

Conclusions:

  • While eGFR reporting aids chronic kidney disease detection, current formulas have drawbacks.
  • The novel race-independent formula presents an advancement in eGFR estimation.