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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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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 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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Quantifying Glomerular Permeability of Fluorescent Macromolecules Using 2-Photon Microscopy in Munich Wistar Rats
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Glomerular Filtration Rate by Gamma Camera-Based Method: Interobserver Agreement at a Single Centre.

Rebecca Sharoon1, Zaigham Salim Dar1, Muhammad Atif2

  • 1Nuclear Medicine Centre, The Armed Forces Institute of Pathology, Rawalpindi, Pakistan.

Journal of the College of Physicians and Surgeons--Pakistan : JCPSP
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This study found excellent interobserver agreement (IOA) in estimating glomerular filtration rate (GFR) using the gamma camera-based method, indicating reliable results for kidney function assessment.

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Area of Science:

  • Nuclear Medicine
  • Renal Physiology

Background:

  • Glomerular filtration rate (GFR) is a key indicator of kidney function.
  • Accurate GFR measurement is crucial for diagnosing and managing kidney diseases.
  • Gamma camera-based methods offer a non-invasive approach to GFR estimation.

Purpose of the Study:

  • To evaluate the interobserver agreement (IOA) in GFR calculation using a gamma camera-based method.
  • To assess the reliability of GFR estimation by multiple observers using technetium-99m diethylene triamine pentaacetate (Tc-99m DTPA) renal scans.

Main Methods:

  • A prospective, cross-sectional study involving 52 patients.
  • Standardized Tc-99m DTPA renal scans were performed.
  • Three observers independently processed the scans to calculate GFR.

Main Results:

  • Excellent interobserver agreement was observed across all patient groups.
  • Intraclass correlation coefficients (ICCs) ranged from 0.985 to 0.997.
  • High ICC values indicate consistent GFR estimations among observers.

Conclusions:

  • The gamma camera-based method demonstrates high reliability for GFR estimation.
  • Excellent IOA suggests this method is robust and reproducible in clinical practice.
  • This technique provides dependable results for assessing kidney function.