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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. This equation is...
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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 (Clcr), a...
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Transdermal Measurement of Glomerular Filtration Rate in Mice
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Significant differences when using MDRD for GFR estimation compared to radionuclide measured clearance.

A J Craig1, A Britten, S D Heenan

  • 1Department of Medical Physics, St. George's Hospital, Knightsbridge Wing, Tooting, London, SW17 0QT, UK. allison.craig@stgeorges.nhs.uk

European Radiology
|May 24, 2011
PubMed
Summary
This summary is machine-generated.

Estimated Glomerular Filtration Rate (eGFR) overestimates radionuclide GFR (rGFR) in radiology patients. This bias is critical for assessing contrast medium risks, particularly nephrotoxicity and Nephrogenic Systemic Fibrosis.

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Area of Science:

  • Nephrology
  • Radiology
  • Medical Imaging

Background:

  • Accurate assessment of renal function is crucial before administering contrast agents in radiology.
  • Estimated Glomerular Filtration Rate (eGFR) is commonly used, but its accuracy compared to radionuclide GFR (rGFR) requires evaluation.

Purpose of the Study:

  • To compare eGFR, calculated using the Modification of Diet in Renal Disease equation, with rGFR in a radiology setting.
  • To assess the reliability of eGFR for evaluating renal function prior to contrast administration.

Main Methods:

  • Retrospective analysis of 516 rGFR studies from a mixed referral population.
  • Calculation of eGFR using the Modification of Diet in Renal Disease equation.
  • Statistical analysis including regression and Bland-Altman methods to compare eGFR and rGFR.

Main Results:

  • A significant correlation (R² = 0.62, p < 0.0001) was found between eGFR and rGFR, but with significant median differences (p < 0.0001).
  • eGFR consistently overestimated rGFR, with a mean bias of 10.8 ml/min/1.73 m² across all ranges.
  • Lower eGFR values showed notable overestimation, impacting the classification of renal insufficiency.

Conclusions:

  • There is a significant bias where eGFR overestimates rGFR in radiology patients.
  • Awareness of this eGFR/rGFR bias is essential for accurately assessing risks of contrast-induced nephrotoxicity and Nephrogenic Systemic Fibrosis.