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Related Concept Videos

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

The glomerular filtration rate (GFR) is a critical indicator of kidney health, reflecting how well the kidneys filter blood. Changes in GFR can signal potential kidney impairment, necessitating accurate measurement methods to monitor kidney function effectively.Various molecules can serve as markers for GFR measurement, with the ideal marker meeting several specific criteria. It must freely filter at the glomerulus, avoid reabsorption or secretion by the renal tubules, remain unmetabolized, not...
Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

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

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. This equation is...
Renal Drug Excretion: Glomerular Filtration01:02

Renal Drug Excretion: Glomerular Filtration

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.
Renal Clearance01:23

Renal Clearance

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...
Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

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...
Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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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Related Experiment Video

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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

Renal failure--measuring the glomerular filtration rate.

Christian Thomas1, Lothar Thomas

  • 1Laboratoriumsmedizin, Krankenhaus Nordwest, Frankfurt am Main. th-books@t-online.de

Deutsches Arzteblatt International
|January 12, 2010
PubMed
Summary

Early detection of chronic kidney disease is crucial. Using creatinine and cystatin C in predictive equations helps estimate glomerular filtration rate (GFR), enabling timely diagnosis and management of kidney disease.

Keywords:
chronic diseasediabetes mellitushypertensionnephropathyrenal failure

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Last Updated: Jun 17, 2026

Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat
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A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
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Area of Science:

  • Nephrology
  • Biomarkers
  • Renal Function

Background:

  • Chronic kidney disease (CKD) is a growing public health concern, primarily driven by hypertension and diabetes.
  • Early stages of CKD, characterized by reduced glomerular filtration rate (GFR), often go undetected, leading to disease progression.
  • Timely identification of diminished GFR is essential for effective clinical intervention.

Purpose of the Study:

  • To review literature and present clinical data on early detection of chronic renal disease.
  • To evaluate the utility of endogenous filtration markers for estimating glomerular filtration rate (GFR).

Main Methods:

  • Selective literature review using PubMed.
  • Analysis of clinical and laboratory data.
  • Evaluation of creatinine and cystatin C as endogenous filtration markers for GFR estimation.

Main Results:

  • Direct GFR measurement using exogenous markers is accurate but costly and time-consuming.
  • Endogenous markers creatinine and cystatin C, used in predictive equations, aid in early CKD diagnosis.
  • Cystatin C-based equations demonstrate higher sensitivity for detecting low GFR compared to creatinine-based equations.

Conclusions:

  • Creatinine and cystatin C based equations are valuable for early diagnosis of chronic renal disease.
  • These equations facilitate disease staging according to National Kidney Foundation criteria.
  • Utilizing these endogenous markers improves the early detection and management of kidney disease.