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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...
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...
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...
Serum Studies: Renal Function Tests01:24

Serum Studies: Renal Function Tests

Renal function tests are crucial for assessing kidney health, monitoring disease progression, and evaluating the kidneys' efficiency in waste elimination, fluid balance, and electrolyte regulation. These tests offer critical insights into kidney function, even though routine measurements may appear normal until there is a significant decline in the glomerular filtration rate or GFR. Typically, signs of kidney impairment only become evident when the GFR falls to about 50% of its normal level.
Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance01:25

Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance

In healthy individuals, serum creatinine levels remain stable due to a balance between its constant production—primarily from muscle metabolism—and renal excretion. Creatinine is freely filtered by the glomeruli, making it a valuable marker for estimating renal function. When the glomerular filtration rate (GFR) decreases, the kidneys can only eliminate less creatinine, causing serum levels to rise.Serum creatinine concentration is widely used to estimate creatinine clearance (Clcr), a...
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...

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Related Experiment Video

Updated: May 14, 2026

Assessment of Kidney Function in Mouse Models of Glomerular Disease
09:16

Assessment of Kidney Function in Mouse Models of Glomerular Disease

Published on: June 30, 2018

Methods of assessing renal function.

Guido Filler1, Abeer Yasin, Mara Medeiros

  • 1Department of Pediatrics, Children's Hospital, London Health Science Centre, University of Western Ontario, 800 Commissioners Road East, London, Ontario, Canada, N6A 5W9, guido.filler@lhsc.on.ca.

Pediatric Nephrology (Berlin, Germany)
|February 19, 2013
PubMed
Summary
This summary is machine-generated.

Accurate kidney function assessment is vital for drug dosing. While inulin clearance is the gold standard for measuring glomerular filtration rate (GFR), newer methods like cystatin C show promise for improved accuracy in children.

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Last Updated: May 14, 2026

Assessment of Kidney Function in Mouse Models of Glomerular Disease
09:16

Assessment of Kidney Function in Mouse Models of Glomerular Disease

Published on: June 30, 2018

Transcutaneous Assessment of Renal Function in Conscious Rodents
07:18

Transcutaneous Assessment of Renal Function in Conscious Rodents

Published on: March 26, 2016

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

Area of Science:

  • Nephrology
  • Pharmacokinetics
  • Biomarkers

Background:

  • Accurate assessment of renal function is critical for drug dosing.
  • Glomerular filtration rate (GFR) is the primary marker of kidney function.
  • Inulin clearance is the gold standard for GFR measurement but is invasive and cumbersome.

Purpose of the Study:

  • To review methods for assessing GFR.
  • To discuss the limitations of current GFR measurement techniques.
  • To explore the potential of endogenous markers for GFR estimation.

Main Methods:

  • Review of inulin clearance as the gold standard.
  • Discussion of nuclear medicine methods (e.g., 51Cr EDTA, iohexol) and their limitations.
  • Evaluation of endogenous markers: serum creatinine, cystatin C, and beta-trace protein.

Main Results:

  • Inulin clearance is accurate but impractical.
  • Nuclear medicine methods have plasma protein binding issues and modeling inaccuracies.
  • Cystatin C shows promise as an endogenous GFR marker, but accuracy may be limited in specific populations.

Conclusions:

  • There is a need for accurate, non-invasive GFR assessment methods.
  • Cystatin C estimation of GFR is a promising area for further research, particularly for pediatric applications.
  • Further validation of urinary nuclear medicine clearance methods in children is warranted.