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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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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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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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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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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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Transdermal Measurement of Glomerular Filtration Rate in Mice
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GFR Estimation After Cystatin C Reference Material Change.

Stefanie W Benoit1,2,3, Thelma Kathman1, Jay Patel1

  • 1Division of Nephrology & Hypertension, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.

Kidney International Reports
|February 22, 2021
PubMed
Summary

The International Federation of Clinical Chemistry (IFCC) standardization of cystatin C assays increased measured values by 24%, impacting estimated glomerular filtration rate (GFR) equations. Updating equations is recommended for accurate GFR assessment.

Keywords:
clinical laboratorycystatin Cequationsglomerular filtration ratepediatric

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Area of Science:

  • Clinical Chemistry
  • Nephrology
  • Pediatric Medicine

Background:

  • Glomerular filtration rate (GFR) is commonly estimated using cystatin C.
  • The International Federation of Clinical Chemistry (IFCC) introduced a standardized cystatin C reference material in 2010, leading to new estimation equations.
  • Siemens transitioned to IFCC-calibrated kits in 2018, necessitating an evaluation of their impact.

Purpose of the Study:

  • To assess the effect of IFCC calibration on cystatin C measurements.
  • To evaluate the impact of IFCC calibration on estimated GFR (eGFR) equations in pediatric patients.

Main Methods:

  • Cystatin C was measured in 81 pediatric patients using plasma samples.
  • Paired cystatin C concentrations were determined using both nonstandardized and IFCC-standardized Siemens kits.
  • GFR-estimating equations were compared using Bland-Altman analysis before and after IFCC standardization.

Main Results:

  • The IFCC-standardized assay showed a mean increase of 24% in measured cystatin C values.
  • Pre-standardization equations consistently overestimated GFR.
  • Post-standardization, the Full Age Spectrum equation performed best overall, while the Chronic Kidney Disease in Children (CKiD) equation was more accurate for reduced GFR.

Conclusions:

  • IFCC standardization significantly increased cystatin C values and altered GFR estimation equation performance.
  • Clinical laboratories and healthcare providers may need to update their GFR estimation equations following the adoption of the IFCC standard.