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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...
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...
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...
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.
Glomerular Filtration01:15

Glomerular Filtration

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: May 20, 2026

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
07:07

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice

Published on: May 10, 2013

Optimized robust plasma sampling for glomerular filtration rate studies.

Anthony W Murray1, Mark A Gannon, Mark C Barnfield

  • 1Department of Medical Physics and Engineering, The Leeds Teaching Hospitals NHS Trust, Leeds, UK. awm@medphysics.leeds.ac.uk

Nuclear Medicine Communications
|July 25, 2012
PubMed
Summary
This summary is machine-generated.

Accurate glomerular filtration rate (GFR) measurement is challenging with abnormal fluid collections. This study found that as few as five timed plasma samples can reliably estimate GFR, even with altered fluid dynamics.

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

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An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney
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An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney

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Related Experiment Videos

Last Updated: May 20, 2026

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
07:07

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice

Published on: May 10, 2013

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

An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney
10:14

An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney

Published on: November 1, 2018

Area of Science:

  • Nuclear Medicine
  • Pharmacokinetics
  • Renal Physiology

Background:

  • Glomerular filtration rate (GFR) measurement using limited plasma samples is unreliable in patients with abnormal fluid collections like ascites.
  • Accurate GFR assessment is crucial for oncology patient management and treatment efficacy.

Purpose of the Study:

  • To determine the minimum number of plasma samples required for accurate GFR measurement in the presence of abnormal fluid collections.
  • To develop and validate a model for optimizing plasma sampling schedules for GFR estimation.

Main Methods:

  • A Monte Carlo model was developed using data from 68 nine-sample GFR tests in 45 oncology patients with abnormal tracer clearance.
  • 20,000 synthetic clearance curves were generated and sampled at various time points (4-10 samples) to estimate the area under the curve via nonlinear regression.
  • Biexponential curve fitting was used to represent clinical plasma curves.

Main Results:

  • The area under the plasma clearance curve can be accurately estimated using as few as five strategically timed samples (5, 10, 15, 90, 180 min).
  • Seven-sample schedules (e.g., 5, 10, 15, 60, 90, 180, 240 min) demonstrated tolerance to missing samples without significant loss of accuracy or precision.
  • A research tool was developed to assess the accuracy and precision of GFR calculations from various sampling patterns, including those with 'third-space' kinetics.

Conclusions:

  • Optimized plasma sampling schedules can enable robust and accurate GFR measurement even in patients with abnormal fluid collections.
  • The developed tool can clinically assess GFR accuracy from incomplete or mistimed sample sets, aiding in clinical decision-making.
  • This research identifies efficient sampling strategies for GFR determination, improving diagnostic reliability in complex patient populations.