Peer-reviewed veterinary case report
Blood test accuracy for kidney function in cats
By Brans, Marleen et al.·Published in Journal of veterinary internal medicine·2021·Small Animal Department·View original on PubMed →
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Original publication title: Plasma symmetric dimethylarginine and creatinine concentrations and glomerular filtration rate in cats with normal and decreased renal function.
- Species:
- cat
Plain-English summary
A group of 49 cats, including those with chronic kidney disease (CKD), diabetes, and healthy cats, were tested to see how well a new blood marker called symmetric dimethylarginine (SDMA) could detect kidney problems compared to the traditional creatinine test. The results showed that cats with CKD had higher levels of both SDMA and creatinine. While both tests were effective in identifying reduced kidney function, creatinine was slightly better at confirming kidney health. This suggests that SDMA can be a useful tool for veterinarians, but it may not replace creatinine testing just yet.
People also search for: cat kidney disease symptoms · SDMA test for cats · creatinine levels in cats
Abstract
BACKGROUND: Glomerular filtration rate (GFR) is the gold standard in assessing renal function but is impractical. Serum creatinine (sCr) has limited sensitivity in identifying early chronic kidney disease (CKD), whereas symmetric dimethylarginine (SDMA) has been commercialized as more accurate biomarker. Studies comparing SDMA and sCr with GFR in cats are limited. OBJECTIVES: To further investigate the diagnostic performance of SDMA in nonazotemic and azotemic cats. ANIMALS: Forty-nine client-owned cats: 17 cats with CKD, 15 cats with diabetes mellitus (DM), and 17 healthy cats. METHODS: Retrospective study using spare blood samples from cats with documented sCr and GFR results for SDMA analysis. Diagnostic performances of SDMA and sCr were evaluated using correlation coefficients, sensitivities, specificities, and receiver operator characteristic curves. RESULTS: Compared to healthy cats and cats with DM, CKD cats had significantly higher SDMA(26.7 ± 9.9 μg/dL) and sCr (249.7 ± 71.6 μmol/L [2.8 ± 0.8 mg/dL]; both P < .001) values. SDMA(τ= -0.57; P < .001) and sCr (τ= -0.56; P < .001) were significantly correlated with GFR. SDMA(τ= 0.52; P < .001) had a significant relationship with sCr. SDMAand sCr had similar sensitivity (76%-94% and 71%-88%, respectively) in detecting reduced renal function. Creatinine had higher specificity (94%-96%) than SDMA(75%-76%) (P < .05). CONCLUSION AND CLINICAL IMPORTANCE: In this study of azotemic and nonazotemic cats, SDMA was a reliable marker to identify decreased GFR. However, superiority of SDMA over sCr could not be confirmed.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/33274800/