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Related Concept Videos

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.
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...
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Acute Kidney Injury IV: Diagnostic Studies and Prevention01:30

Acute Kidney Injury IV: Diagnostic Studies and Prevention

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Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
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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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Acute Kidney Injury V: Interprofessional Care01:20

Acute Kidney Injury V: Interprofessional Care

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Acute Kidney Injury (AKI) requires a collaborative healthcare approach to restore renal function and prevent complications. Essential management strategies involve monitoring fluid and electrolyte balance, adjusting medications, initiating dialysis when necessary, and providing nutritional support.Fluid and Electrolyte ManagementFluid Monitoring: Regularly monitoring body weight, central venous pressure, and urine output helps detect fluid imbalances early. Patient intake and output are...
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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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Serum Studies: Renal Function Tests01:24

Serum Studies: Renal Function Tests

306
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.
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Related Experiment Video

Updated: Dec 30, 2025

Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat
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Renal Function Assessment Gap in Clinical Practice: An Awkward Truth.

Francesco Trevisani1,2, Federico Di Marco3, Umberto Capitanio4,3

  • 1Department of Urology, San Raffaele Scientific Institute, Milan, Italy, trevisani.francesco@hsr.it.

Kidney & Blood Pressure Research
|January 27, 2020
PubMed
Summary

Estimated glomerular filtration rate (eGFR) formulas show significant errors compared to measured GFR (mGFR). Iohexol plasma clearance is recommended for critical cases, especially in urological, oncological, and nephrological patients with low eGFR.

Keywords:
Cystatin CEstimated glomerular filtration rateGlomerular filtration rateMeasured glomerular filtration rateRenal functionRenal measurement techniquesSerum creatinine

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Area of Science:

  • Nephrology
  • Clinical Chemistry
  • Medical Imaging

Background:

  • Accurate assessment of renal function is crucial in clinical practice.
  • Current estimated glomerular filtration rate (eGFR) formulas exhibit significant inaccuracies compared to measured glomerular filtration rate (mGFR) gold standards.

Purpose of the Study:

  • To quantify the error of common eGFR formulas against mGFR across diverse clinical settings.
  • To compare the diagnostic accuracy of different eGFR estimation methods with gold standard GFR measurements.

Main Methods:

  • Retrospective analysis of 1,320 patients from two European hospitals.
  • Comparison of prevalent eGFR formulas with Iohexol Plasma Clearance (mGFR-iox) and Renal Scintigraphy (mGFR-scnt).
  • Evaluation of agreement using bias, precision, accuracy (P30), and total deviation index.

Main Results:

  • The CKD-EPIcr-cy formula showed the highest accuracy against mGFR-iox in Center 1, but with reduced P30 below 60 mL/min/1.73 m2.
  • Center 2 exhibited greater discrepancies between mGFR-scnt and eGFR, indicating limitations of the scintigraphy technique.
  • Accuracy of eGFR formulas decreases at lower GFR values.

Conclusions:

  • Gold standard methods like Iohexol Plasma Clearance are essential for accurate renal function assessment in critical cases, particularly when eGFR is below 60 mL/min/1.73 m2.
  • Renal Scintigraphy may contribute to inaccuracies observed in Center 2.
  • Recommended use of mGFR-iox for urological, oncological, and nephrological patients with eGFR < 60 mL/min/1.73 m2.