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Related Concept Videos

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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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

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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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Urodynamic Studies: Uroflowmetry01:19

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Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
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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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Factors Affecting Renal Clearance: Renal Impairment01:17

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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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One-Compartment Open Model: Urinary Excretion Data and Determination of k01:11

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The one-compartment open model leverages urinary excretion data to estimate renal clearance, which gauges the kidney's capacity to expel a drug. This method offers several benefits, including directly measuring drug elimination and assessing the kidney's contribution to overall drug clearance. However, this approach has limitations. It assumes sole renal excretion of the drug, which is not true for all drugs. Accurate urinary excretion and plasma drug concentration measurement can also...
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Related Experiment Video

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A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
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A Simple Equation to Estimate Urinary Flow Rate Using Urine Creatinine.

Luke Webster1, Brett Larive2, Jennifer Gassman2

  • 1Division of Nephrology-Hypertension, Department of Medicine, University of California San Diego, San Diego, California, USA.

American Journal of Nephrology
|March 10, 2020
PubMed
Summary

A new equation accurately estimates urine flow rate using urine creatinine and body weight. This method offers clinical utility for challenging urine flow assessments in nephrology practice.

Keywords:
CreatinineKidney diseasePredictionUrine volume

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Area of Science:

  • Nephrology
  • Clinical Chemistry
  • Biostatistics

Background:

  • Accurate urine flow rate assessment is difficult in clinical settings.
  • Existing methods for urine flow measurement present challenges.
  • Nephrology clinical practice requires reliable urine flow estimation.

Purpose of the Study:

  • To derive and validate an equation for estimating urine flow rate (eV).
  • To improve the accuracy of urine flow rate assessment in clinical practice.
  • To utilize existing nephrology equations for urine flow estimation.

Main Methods:

  • Derived the eV equation using Cockcroft-Gault and creatinine clearance.
  • Utilized data from the AASK and COMBINE clinical trials for derivation and validation.
  • Identified participants with accurate 24-h urine collections as a gold standard.

Main Results:

  • Initial eV equation showed high correlation (r=0.91) but underestimation (9.5 mL/h bias).
  • A corrected eV equation improved bias (5.3 mL/h) and maintained high correlation (r=0.91).
  • 80% of individuals had eV within 20% of measured urine flow rate.

Conclusions:

  • A simple equation using urine creatinine, demographics, and body weight accurately predicts urine flow rate.
  • The developed equation demonstrates potential clinical utility for difficult urine flow measurements.
  • This method offers a practical approach to urine flow rate estimation in nephrology.