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Related Concept Videos

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

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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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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

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

Factors Affecting Renal Clearance: Renal Impairment

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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.
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Renal Clearance01:23

Renal Clearance

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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.
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Renal Drug Excretion: Glomerular Filtration01:02

Renal Drug Excretion: 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 occurs. A nephron has two main components: a renal corpuscle and a renal tubule.
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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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Related Experiment Video

Updated: Dec 21, 2025

Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat
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Kidney Disease, Race, and GFR Estimation.

Andrew S Levey1, Silvia M Titan1, Neil R Powe2

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

Clinical Journal of the American Society of Nephrology : CJASN
|May 13, 2020
PubMed
Summary

Estimating glomerular filtration rate (GFR) using serum creatinine is crucial. The current method includes a race coefficient, but a more cautious approach is needed to maintain accuracy and avoid bias.

Keywords:
African AmericansBody Weights and MeasuresChronicCystatin CDecision MakingDemographyHealth PersonnelKidney Function TestsPublic HealthRenal InsufficiencySharedcreatinineglomerular filtration ratehuman

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Area of Science:

  • Nephrology and clinical chemistry
  • Epidemiology and public health
  • Biostatistics and predictive modeling

Background:

  • Glomerular filtration rate (GFR) assessment is vital for clinical practice, research, and public health.
  • Current Kidney Disease Improving Global Outcomes guidelines recommend serum creatinine for initial GFR evaluation.
  • Serum creatinine levels are influenced by both GFR and creatinine metabolism, necessitating adjustments for muscle mass surrogates like age, sex, race, height, or weight.

Purpose of the Study:

  • To evaluate the impact of race coefficients in GFR estimation equations.
  • To propose a refined approach for GFR estimation that maintains accuracy and avoids racial bias.
  • To advocate for improved GFR estimation methods that do not rely on demographic characteristics.

Main Methods:

  • Analysis of the 2009 Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) creatinine equation, which includes a race coefficient.
  • Review of the implications of race-based adjustments on GFR estimation accuracy.
  • Consideration of alternative approaches, including cystatin C and clearance measurements.

Main Results:

  • The CKD-EPI equation uses race to account for differences in serum creatinine determinants, showing higher average GFR in Black individuals.
  • Eliminating the race coefficient could lead to systematic underestimation of GFR in Black populations.
  • The study highlights limitations and potential unintended consequences of using race in GFR estimation.

Conclusions:

  • A cautious approach is proposed to maintain GFR estimation accuracy while avoiding disadvantage to any racial group.
  • Recommendations include full disclosure of race use, accommodating race non-identification, shared decision-making, and judicious use of cystatin C.
  • Future research should focus on developing superior GFR estimation methods independent of race or other demographic factors.