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The serum cystatin C (Cys-C) concentration is a better filtration marker than plasma creatinine (Cre) concentration in humans. In veterinary medicine, a few studies have shown that the serum Cys-C concentration in dogs is also a better marker than the plasma Cre concentration. The purpose of this study is to evaluate the applicability of measuring the serum Cys-C concentration by an enzyme-linked immunosorbent assay (ELISA) as a marker of the glomerular filtration rate in dogs with various renal dysfunctions. The serum Cys-C concentration in dogs with chronic kidney disease (CKD) was significantly higher (1.23 +/- 0.21 mg/L) than that in 76 control dogs (0.85 +/- 0.15) (P&lt;0.001). The reference range of the serum Cys-C concentrations in samples from the 76 control dogs was 0.55-1.15 mg/l. Serum Cys-C concentration was more strongly correlated with plasma iohexol clearance (r=-0.704, P&lt;0.001) than plasma Cre concentration in dogs (r=-0.598, P&lt;0.001). In a receiver operating characteristics analysis, significant differences between the serum Cys-C and plasma Cre concentrations were found with regard to their AUC (0.949, [SE, 0.019] and 0.849 [SE, 0.029]) and diagnostic sensitivity (90.3% and 73.6%) for detecting decreased PCio (P&lt;0.05). Therefore, the measurement of serum Cys-C concentration by ELISA is more useful for the detection of early CKD than measuring the plasma Cre concentration.

journal of veterinary medical science

Evaluation of the Measurement of Serum Cystatin C by an Enzyme-Linked Immunosorbent Assay for Humans as a Marker of the Glomerular Filtration Rate in Dogs