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Clin Kidney J. 2016 Oct;9(5):700-4. doi: 10.1093/ckj/sfw071. Epub 2016 Sep 09.

Iohexol plasma clearance for measuring glomerular filtration rate in clinical practice and research: a review. Part 2: Why to measure glomerular filtration rate with iohexol?.

Clinical kidney journal

Pierre Delanaye, Toralf Melsom, Natalie Ebert, Sten-Erik Bäck, Christophe Mariat, Etienne Cavalier, Jonas Björk, Anders Christensson, Ulf Nyman, Esteban Porrini, Giuseppe Remuzzi, Piero Ruggenenti, Elke Schaeffner, Inga Soveri, Gunnar Sterner, Bjørn Odvar Eriksen, Flavio Gaspari

Affiliations

  1. Department of Nephrology, Dialysis and Transplantation , University of Liège Hospital (ULg CHU) , 4000 Liège , Belgium.
  2. Metabolic and Renal Research Group , UiT The Arctic University of Norway and Section of Nephrology, University Hospital of North Norway , Tromsø , Norway.
  3. Charité University Medicine, Institute of Public Health, Berlin , Germany.
  4. Department of Clinical Chemistry , Skåne University Hospital , Lund , Sweden.
  5. Department of Nephrology, Dialysis, Transplantation and Hypertension , CHU Hôpital Nord, University Jean Monnet, PRES Université de LYON , Saint-Etienne , France.
  6. Department of Clinical Chemistry , University of Liège Hospital (ULg CHU) , Liège , Belgium.
  7. Department of Occupational and Environmental Medicine , Lund University , Lund , Sweden.
  8. Department of Nephrology , Skåne University Hospital , Lund , Sweden.
  9. Department of Translational Medicine, Division of Medical Radiology , Skåne University Hospital , Malmö , Sweden.
  10. University of La Laguna, CIBICAN-ITB, Faculty of Medicine, Hospital Universtario de Canarias , Tenerife , Spain.
  11. Centro di Ricerche Cliniche per le Malattie Rare 'Aldo e Cele Daccò', Istituto di Ricerche Farmacologiche Mario Negri, Centro Anna Maria Astori, Science and Technology Park Kilometro Rosso, Bergamo, Italy; Unit of Nephrology, Azienda Socio Sanitaria Territoriale (ASST) Ospedale Papa Giovanni XXIII, Bergamo, Italy.
  12. Department of Medical Sciences , Uppsala University , Uppsala , Sweden.
  13. Department of Nephrology , Skåne University Hospital , Malmö , Sweden.
  14. IRCCS - Istituto di Ricerche Farmacologiche 'Mario Negri', Centro di Ricerche Cliniche per le Malattie Rare 'Aldo e Cele Daccò', Ranica, Bergamo, Italy.

PMID: 27679716 PMCID: PMC5036903 DOI: 10.1093/ckj/sfw071

Abstract

A reliable assessment of glomerular filtration rate (GFR) is of paramount importance in clinical practice as well as epidemiological and clinical research settings. It is recommended by Kidney Disease: Improving Global Outcomes guidelines in specific populations (anorectic, cirrhotic, obese, renal and non-renal transplant patients) where estimation equations are unreliable. Measured GFR is the only valuable test to confirm or confute the status of chronic kidney disease (CKD), to evaluate the slope of renal function decay over time, to assess the suitability of living kidney donors and for dosing of potentially toxic medication with a narrow therapeutic index. Abnormally elevated GFR or hyperfiltration in patients with diabetes or obesity can be correctly diagnosed only by measuring GFR. GFR measurement contributes to assessing the true CKD prevalence rate, avoiding discrepancies due to GFR estimation with different equations. Using measured GFR, successfully accomplished in large epidemiological studies, is the only way to study the potential link between decreased renal function and cardiovascular or total mortality, being sure that this association is not due to confounders, i.e. non-GFR determinants of biomarkers. In clinical research, it has been shown that measured GFR (or measured GFR slope) as a secondary endpoint as compared with estimated GFR detected subtle treatment effects and obtained these results with a comparatively smaller sample size than trials choosing estimated GFR. Measuring GFR by iohexol has several advantages: simplicity, low cost, stability and low interlaboratory variation. Iohexol plasma clearance represents the best chance for implementing a standardized GFR measurement protocol applicable worldwide both in clinical practice and in research.

Keywords: glomerular filtration rate; iohexol

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