Cover American Journal of Veterinary Research
American Journal of Veterinary Research
ISSN:
0002-9645
Publication Date:
01 Feb 2009
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Editorial Type:
Analytic Techniques

Estimation of glomerular filtration rate via 2- and 4-sample plasma clearance of iohexol and creatinine in clinically normal cats

Reidun Heiene DVM, PhD1, Brice S. Reynolds DVM2, Nicholas H. Bexfield BVetMed3, Stig Larsen PhD4, and Robert J. Gerritsen DVM5
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  • 1 Department of Companion Animal Clinical Sciences, Norwegian School of Veterinary Science, 0033 Oslo, Norway.
  • | 2 Department of Clinical Sciences, National Veterinary School of Toulouse, 31076 Toulouse Cedex 3, France.
  • | 3 Department of Veterinary Medicine, University of Cambridge, CB3 0ES Cambridge, England.
  • | 4 Center for Epidemiology and Statistics, Norwegian School of Veterinary Science, 0033 Oslo, Norway.
  • | 5 De Kompaan Referral Centre, Van Reeuwijkstraat 34, 7731 EH Ommen, The Netherlands.
DOI:
https://doi.org/10.2460/ajvr.70.2.176
Volume/Issue:
Volume 70: Issue 2
Online Publication Date:
01 Feb 2009
Restricted access
Reprints and Permissions Purchase Article

Abstract

Objective—To compare 2 methods for estimation of glomerular filtration rate (GFR), study the effects of age and body size on GFR estimates, and provide a reference range for estimated GFR in clinically normal cats.

Animals—57 cats.

Procedures—In each cat, GFR was estimated via plasma clearance of iohexol and creatinine. Results of a 1-compartmental model (CL1comp) were calibrated to a trapezoidal method estimate (CLtrap) by use of a correction formula applicable to dogs or humans and standardized to body weight; for iohexol clearance, data were also standardized to extracellular fluid volume (ECFV). For all 57 cats, method comparison was performed via agreement analysis. Reference ranges for GFR derived by the different methods were established by use of data from a subset of 51 cats after exclusion of 6 cats that were azotemic, Birman, or both.

Results—In 57 cats, mean CLtrap of creatinine was 0.29 mL/min/kg (13%) higher than CLtrap of iohexol. In 51 nonazotemic cats, mean CLtrap was 2.26 mL/min/kg for iohexol (reference range, 1.02 to 3.50 mL/min/kg) and 2.55 mL/min/kg for creatinine (reference range, 1.27 to 3.83 mL/min/kg). Values of GFR/kg or GFR standardized to liters of ECFV did not decrease with increasing age. A negative linear relationship was detected between body weight and estimated GFR/kg or GFR standardized to liters of ECFV.

Conclusions and Clinical Relevance—Reference ranges for estimated GFR via plasma clearance of iohexol and creatinine should facilitate early detection of impaired renal function in cats, although body weight should be taken into account.

Contributor Notes

Supported by a grant from the Norwegian Research Council.

The authors thank Siska Croubels for performing the iohexol analysis.

Address correspondence to Dr. Heiene.