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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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Renal Drug Clearance: Comparison Between Renal Excretion Methods01:08

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Renal clearance is a critical parameter encompassing kidney filtration, secretion, and reabsorption processes. It is calculated using a specific equation to determine the rate at which the kidneys clear a drug.
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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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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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Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
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Determination of Renal Drug Clearance: Graphical and Midpoint Methods01:07

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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.
The graphical method involves plotting the rate of drug excretion in urine against the plasma drug concentration. By analyzing the graph, the clearance can be calculated and obtained. Drugs rapidly excreted by the kidneys exhibit a...
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LC-MS/MS Method for Serum Creatinine: Comparison with Enzymatic Method and Jaffe Method.

Meixian Ou1, Yunxiao Song2, Shuijun Li1

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A new liquid chromatography tandem mass spectrometry (LC-MS/MS) method accurately quantifies serum creatinine (Cre), offering improved precision over routine enzymatic and Jaffe methods. This advancement is crucial for reliable glomerular filtration rate (GFR) estimation.

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Area of Science:

  • Clinical Chemistry
  • Analytical Chemistry
  • Biomarker Quantification

Background:

  • Accurate serum creatinine (Cre) quantification is essential for estimating glomerular filtration rate (GFR).
  • Previous methods for Cre measurement have shown notable discrepancies.
  • Standardized and precise Cre measurement is critical for clinical diagnostics.

Purpose of the Study:

  • To develop and validate a liquid chromatography tandem mass spectrometry (LC-MS/MS) method for serum Cre quantification.
  • To compare the performance of the developed LC-MS/MS method against commonly used clinical routine methods (enzymatic and Jaffe).
  • To establish reference intervals for serum Cre using the LC-MS/MS method.

Main Methods:

  • Serum samples were analyzed using an Agilent 1200 LC system coupled to an API 4000 triple quadrupole mass spectrometer.
  • A one-step protein precipitation with methanol was employed for sample preparation, using isotope-labeled Cre-d3 as an internal standard.
  • The LC-MS/MS method was validated for accuracy, precision, linearity, and robustness, and compared with enzymatic and Jaffe assays.

Main Results:

  • The developed LC-MS/MS method demonstrated a low limit of quantification (4.4 μmol/L), high precision (1.15%-3.84% imprecision), and minimal bias (1.06%).
  • No significant matrix effects, carryover, or interference were observed, indicating high specificity.
  • The LC-MS/MS method revealed significant biases in the enzymatic (-2.1%) and Jaffe (11.7%) methods, particularly in challenging hemolytic and lipemic samples.

Conclusions:

  • A simple, specific, and accurate LC-MS/MS method for serum Cre analysis has been successfully developed.
  • The study highlights significant discordance between the LC-MS/MS method and conventional clinical assays.
  • The LC-MS/MS method provides a more reliable approach for serum Cre quantification, essential for accurate GFR estimation.