Open Access
Research (Published online: 30-06-2022)
25. Cystatin C assay validation using the immunoturbidimetric method to evaluate the renal function of healthy dogs and dogs with acute renal injury
Fabiola de Oliveira Paes-Leme, Eliana Matias de Souza, Mariah Gois Ceregatti, Marco Túlio Gomes Campos, Patricia Donado Vaz de Melo and Adriane Pimenta da Costa-Val
Veterinary World, 15(6): 1595-1600

Fabiola de Oliveira Paes-Leme: Department of Clinics and Surgery, Veterinary School, Federal University of Minas Gerais, Belo Horizonte, Brazil.
Eliana Matias de Souza: Department of Clinics and Surgery, Veterinary School, Federal University of Minas Gerais, Belo Horizonte, Brazil.
Mariah Gois Ceregatti: Department of Clinics and Surgery, Veterinary School, Federal University of Minas Gerais, Belo Horizonte, Brazil.
Marco Túlio Gomes Campos: Department of Clinics and Surgery, Veterinary School, Federal University of Minas Gerais, Belo Horizonte, Brazil.
Patricia Donado Vaz de Melo: Labtest Diagnostica SA, Lagoa Santa, Brazil.
Adriane Pimenta da Costa-Val: Department of Clinics and Surgery, Veterinary School, Federal University of Minas Gerais, Belo Horizonte, Brazil.

doi: www.doi.org/10.14202/vetworld.2022.1595-1600

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Article history: Received: 05-11-2021, Accepted: 17-05-2022, Published online: 30-06-2022

Corresponding author: Fabiola de Oliveira Paes-Leme

E-mail: fabiolapaesleme@vetufmg.edu.br

Citation: Paes-Leme FO, de Souza EM, Ceregatti MG, Campos MTG, Vaz de Melo PD, da Costa-Val AP (2022) Cystatin C assay validation using the immunoturbidimetric method to evaluate the renal function of healthy dogs and dogs with acute renal injury, Veterinary World, 15(6): 1595–1600.
Abstract

Background and Aim: Acute kidney injury (AKI) is associated with a grave prognosis. A clinical assessment of kidney function can be performed based on the glomerular filtration rate (GFR). Cystatin C (CysC) can indicate the GFR or kidney function and its measurement is currently performed using immunological methods such as nephelometry, immunoturbidimetry, and enzyme-linked immunosorbent assays in human medicine. However, these techniques are not specific for use in veterinary medicine. This study aimed to validate an immunoturbidimetric assay for serum CysC (sCy) in dogs, determine the sCy reference intervals for healthy dogs, evaluate sCy stability in serum samples, and compare sCy with serum creatinine (sCr) in healthy dogs and dogs with AKI.

Materials and Methods: Forty-three dogs were divided into a control group (n = 19) and an AKI group (n = 24). An immunoturbidimetric method including commercially available human CysC calibrated with canine CysC was used to evaluate canine serum samples.

Results: An average recovery of 97% was observed for canine serum samples. The reference interval for CysC in healthy dogs was 0.57–1.29 mg/L. The sCy concentration in dogs with AKI was significantly higher (2.82 ± 1.46 mg/L) than in healthy dogs (0.93 ± 0.18 mg/L). Statistical analysis confirmed a strong correlation between sCy and sCr (r = 0.94; p < 0.05) in dogs with AKI.

Conclusion: The immunoturbidimetric method of evaluating sCy yielded satisfactory results and can be used for canine samples when a species-specific calibrator is used. Furthermore, sCy is a reliable marker of renal dysfunction in dogs. It is best to store samples for sCy evaluation at temperatures between 4°C and 8°C.

Keywords: canine, immunoturbidimetry, kidney.