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Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance01:25

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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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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...
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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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Renal clearance, a crucial parameter in pharmacokinetics, can be determined using two different methods: the graphical method and the midpoint method. These methods provide insights into the rate of drug excretion by the kidneys and aid in assessing renal function.
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Serum Studies: Renal Function Tests01:24

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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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Evaluating an alternative method for rapid urinary creatinine determination.

Erik M Andersen1, Jon R Sobus, Mark J Strynar

  • 1a Human Exposure and Atmospheric Sciences Division , National Exposure Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency , Research Triangle Park , North Carolina , USA.

Journal of Toxicology and Environmental Health. Part A
|July 30, 2014
PubMed
Summary
This summary is machine-generated.

A new plateau Jaffé (PJ) method offers a viable alternative for measuring urinary creatinine concentration (CRc). This method provides comparable precision and accuracy to the standard kinetic Jaffé (KJ) method without requiring automated equipment.

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Area of Science:

  • Clinical Chemistry
  • Analytical Chemistry
  • Biochemistry

Background:

  • Creatinine (CR) is a key biomarker for assessing kidney function and sample dilution.
  • The standard kinetic Jaffé (KJ) method requires automation for moderate- to high-throughput analysis.
  • There is a need for alternative methods that are less equipment-dependent.

Purpose of the Study:

  • To evaluate the plateau Jaffé (PJ) method as an alternative to the kinetic Jaffé (KJ) method for urinary creatinine concentration (CRc) determination.
  • To assess the precision and accuracy of the PJ method compared to KJ and LC-TOF/MS.
  • To determine the suitability of the PJ method for moderate-throughput analysis without automation.

Main Methods:

  • Analyzed 32 spot urine samples using the PJ method, the standard KJ method, and liquid chromatography time-of-flight mass spectrometry (LC-TOF/MS) as a benchmark.
  • Assessed method precision using replicate measurements and coefficient of variation.
  • Evaluated method accuracy using linear regression models comparing PJ and KJ to LC-TOF/MS.

Main Results:

  • Measurement precision was comparable across all three methods (CVs 3-6%).
  • Linear regression showed strong agreement between methods (R² 0.996-0.998).
  • Minor bias (2-16%) was observed at the extremes, with regression equations provided for adjustment.

Conclusions:

  • The plateau Jaffé (PJ) method is a suitable alternative for urinary CRc determination.
  • PJ method offers comparable analytical performance to the KJ method.
  • PJ method is practical for moderate-throughput labs with standard instrumentation and manual techniques.