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Related Concept Videos

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
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 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...
Renal Failure: Dose Adjustments01:11

Renal Failure: Dose Adjustments

In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
Reduced renal clearance and elimination rate are common outcomes of renal impairment. These alterations lead to a prolonged elimination half-life and an altered apparent volume of distribution for drugs. As a result, dosage adjustments are typically necessary to maintain optimal drug levels in the body.
However, dosage adjustments...
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...

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Early Detection of Drug-Induced Renal Hemodynamic Dysfunction Using Sonographic Technology in Rats
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Estimating renal function for drug dosing decisions.

Graham Rd Jones1

  • 1Department of Chemical Pathology, SydPath, St Vincent's Hospital, Sydney, Victoria St, Darlinghurst, NSW 2010, Australia.

The Clinical Biochemist. Reviews
|May 26, 2011
PubMed
Summary

Estimating glomerular filtration rate (GFR) is crucial for adjusting drug doses in patients with reduced kidney function. This study compares traditional methods with newer formulas like MDRD and CKD-EPI to guide clinical practice.

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Last Updated: Jun 1, 2026

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Area of Science:

  • Nephrology
  • Pharmacology
  • Clinical Chemistry

Background:

  • Accurate estimation of Glomerular Filtration Rate (GFR) is essential for dose adjustment of renally excreted drugs.
  • Reduced renal function necessitates quantitative GFR assessment for safe and effective medication management.
  • Traditional methods like Cockcroft and Gault equation and creatinine clearance have been widely used.

Purpose of the Study:

  • To compare the accuracy and utility of different GFR estimation methods.
  • To address confusion among healthcare professionals regarding the best approach for assessing renal function.
  • To propose a standardized method for future clinical practice.

Main Methods:

  • Comparative analysis of GFR estimation formulas.
  • Evaluation of Cockcroft and Gault equation.
  • Assessment of Modification of Diet in Renal Disease (MDRD) formula.
  • Analysis of Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formula.

Main Results:

  • The study evaluates the performance of MDRD and CKD-EPI formulas against traditional methods.
  • Comparison highlights differences in GFR estimates provided by each formula.
  • Findings aim to clarify the clinical applicability of each method.

Conclusions:

  • The study provides insights into the comparative performance of GFR estimation equations.
  • Recommendations are made for optimal use of GFR estimation in clinical settings.
  • A proposal for future practice in renal function assessment is presented.