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Use of carbamylated hemoglobin concentration to differentiate acute from chronic renal failure in dogs
S L Vaden1, J Gookin, M Trogdon
1Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh 27606, USA.
Insights
Carbamylated hemoglobin (CarHb) concentration effectively differentiates acute renal failure (ARF) from chronic renal failure (CRF) in dogs. This biomarker aids in accurate diagnosis, enabling timely treatment for improved recovery chances.
Area of Science:
- Veterinary Medicine
- Biochemistry
- Renal Physiology
Background:
- Differentiating acute renal failure (ARF) from chronic renal failure (CRF) in dogs is clinically significant for treatment and prognosis.
- Current diagnostic methods may not always provide definitive differentiation.
- Carbamylated hemoglobin (CarHb) is a potential biomarker for assessing renal dysfunction.
Purpose of the Study:
- To evaluate the diagnostic utility of CarHb concentration in distinguishing ARF from CRF in canine patients.
- To assess the correlation of CarHb levels with established markers of renal function.
Main Methods:
- CarHb concentration was measured using high-performance liquid chromatography (HPLC) assay.
- The assay quantifies valine hydantoin (VH) derived from carbamylated valine in hemoglobin.
- Blood samples were analyzed from dogs diagnosed with ARF, CRF, and healthy controls.
Main Results:
- CarHb concentrations were significantly elevated in both ARF and CRF groups compared to controls (P < 0.05 and P < 0.001, respectively).
- CRF dogs exhibited significantly higher CarHb levels than ARF dogs (P < 0.001).
- CarHb did not correlate with serum urea nitrogen or creatinine. A cutoff of 100 µg VH/g Hb achieved 96.1% sensitivity and 84.2% specificity for differentiating ARF from CRF.
Conclusions:
- CarHb concentration is a valuable tool for differentiating ARF from CRF in dogs.
- Elevated CarHb levels indicate renal failure, with higher concentrations suggesting chronicity.
- Utilizing CarHb measurement can enhance diagnostic accuracy for ARF, facilitating prompt therapeutic interventions and potentially improving patient outcomes.
Objective:
To determine usefulness of carbamylated hemoglobin (CarHb) concentration for differentiation of acute renal failure (ARF) from chronic renal failure (CRF) in dogs.
Sample Population:
Samples from dogs with ARF or CRF and from nonazotemic control dogs.
Procedure:
CarHb concentration was determined in heparinized blood samples by measuring the micrograms of valine hydantoin (VH) per gram of hemoglobin (Hb), using a high-performance liquid chromatography assay, in which carbamyl valine is converted to VH via acid hydrolysis.
Results:
CarHb concentration was significantly higher in dogs with ARF and CRF, compared with values in control dogs (ARF vs control, P < 0.05; CRF vs control, P < 0.001). Furthermore, CarHb concentration was significantly (P < 0.001) higher in dogs with CRF, compared with that in dogs with ARF. Carbamylated hemoglobin concentration did not correlate with serum urea nitrogen or creatinine concentration. Using a cutoff value of 100 micrograms of VH/g of Hb, the sensitivity and specificity of CarHb concentration for differentiating ARF from CRF was 96.1 and 84.2%, respectively.
Conclusions:
CarHb concentration was useful in the differentiation of ARF from CRF in the dogs of this study.
Clinical Relevance:
CarHb concentration may be used to increase the accuracy of identifying ARF, so that early, aggressive management can be instituted, thereby increasing the chance of recovery.