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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...
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: 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...
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...
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...
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: Jun 17, 2026

Long-Term Continuous Measurement of Renal Blood Flow in Conscious Rats
05:09

Long-Term Continuous Measurement of Renal Blood Flow in Conscious Rats

Published on: February 8, 2022

Longitudinal measurements of renal function.

Paul Muntner1

  • 1Department of Community and Preventive Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA. paul.muntner@mssm.edu

Seminars in Nephrology
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

Longitudinal studies reveal that kidney function can decline with age. However, a significant portion of adults do not experience this decline, highlighting the need for further research into renal function changes over time.

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Area of Science:

  • Nephrology
  • Gerontology
  • Epidemiology

Background:

  • Cross-sectional studies suggest age-related renal function decline.
  • Longitudinal data on within-individual changes in kidney function are limited.

Purpose of the Study:

  • To analyze longitudinal changes in renal function over time.
  • To identify the proportion of individuals with and without renal function decline.

Main Methods:

  • Analysis of data from the Baltimore Longitudinal Study of Aging (BLSA).
  • Inclusion of a subsample without renal disease, followed up to 23 years.
  • Examination of data from the African-American Study of Kidney Disease (AASK) with up to 10 years of follow-up.

Main Results:

  • In the BLSA, creatinine clearance declined by -0.75 mL/min/1.73 m(2) per year; 35% showed no decline.
  • In the AASK, mean annual decline in estimated glomerular filtration rate (eGFR) was -2.11 and -1.50 mL/min/1.73 m(2) during trial and observational phases.
  • Among AASK participants with ≥7 years follow-up, 33.5% had eGFR decline < -1 mL/min/1.73 m(2) per year.

Conclusions:

  • Longitudinal data provide crucial insights into individual renal function trajectories.
  • A notable percentage of individuals maintain stable renal function despite aging or chronic kidney disease.
  • Further research is essential for informing clinical practice, research, and health policy regarding renal function.