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Related Concept Videos

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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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

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Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
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Glomerular Filtration01:15

Glomerular Filtration

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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
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Glomerular Filtration: Net Filtration Pressure01:26

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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).
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Renal Drug Excretion: Glomerular Filtration01:02

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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.
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Drug Elimination by Renal Route: Glomerular Filtration01:17

Drug Elimination by Renal Route: Glomerular Filtration

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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 takes place. 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...
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Updated: Jan 26, 2026

Transdermal Measurement of Glomerular Filtration Rate in Mice
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Improving glomerular filtration rate estimation.

Andrew S Levey1, Lesley A Inker1

  • 1Division of Nephrology, Tufts Medical Center, Boston, Massachusetts, USA.

Kidney International
|April 24, 2019
PubMed
Summary
This summary is machine-generated.

The African American race-ethnicity factor is not applicable for estimating glomerular filtration rate (GFR) in sub-Saharan Africa. Newer equations offer no accuracy improvement over existing guidelines for GFR estimation in this population.

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Area of Science:

  • Nephrology
  • Clinical Epidemiology

Background:

  • Glomerular filtration rate (GFR) estimating equations are crucial for diagnosing and managing kidney disease.
  • Current equations often rely on race-ethnicity factors, which may not be universally applicable.
  • The accuracy of these equations is a significant concern in diverse populations.

Purpose of the Study:

  • To evaluate the accuracy of commonly used GFR estimating equations and race-ethnicity factors in sub-Saharan Africa.
  • To determine if newer GFR estimating equations outperform existing ones in this specific population.

Main Methods:

  • The study assessed GFR estimating equations in two centers in sub-Saharan Africa.
  • Accuracy was evaluated by comparing estimated GFR (eGFR) with measured GFR.
  • The applicability of the African American race-ethnicity factor was specifically investigated.

Main Results:

  • The African American race-ethnicity factor was found to be inapplicable in the studied sub-Saharan African population.
  • Newer GFR estimating equations did not demonstrate superior accuracy compared to the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equations.
  • The CKD-EPI equations, recommended by current guidelines, showed similar performance to newer alternatives.

Conclusions:

  • Race-ethnicity adjustments in GFR equations require careful validation in diverse populations, as factors used in one region may not apply elsewhere.
  • Current guidelines' recommended CKD-EPI equations remain a reliable choice for GFR estimation in this sub-Saharan African context.
  • Further research is needed to develop and validate GFR estimating equations tailored for African populations.