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Urinary orotic acid-to-creatinine ratios in cats with hepatic lipidosis
J L VanSteenhouse1, D S Dimski, D H Swenson
1Department of Veterinary Pathology, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803, USA.
Objective:
To determine urinary orotic acid (OA) concentration and evaluate the urinary OA-to-creatinine ratio (OACR) in cats with hepatic lipidosis (HL).
Animals:
20 cats with HL and 20 clinically normal cats.
Procedure:
Hepatic lipidosis was diagnosed on the basis of clinical signs, results of serum biochemical analyses, exclusion of other concurrent illness, and cytologic or histologic evaluation of liver biopsy specimens. Urine samples were collected from each cat and frozen at -20 C until assayed. Urine creatinine concentrations were determined, using an alkaline picrate method followed by spectrophotometric assay. Urine OA concentration was determined, using high-performance liquid chromatography. Minimum amount of detectable OA in feline urine was 1 microg/ml. Because of small interfering peaks near the base of the OA peak, the minimum quantifiable concentration of OA was determined to be 5 microg/ml. Urinary OACR was compared in both groups of cats.
Results:
Differences in urinary OACR were not detected between clinically normal cats and cats with HL. Peaks were not detected for urinary OA in any of the 20 clinically normal cats. Of the 20 HL cats, 14 did not have detectable peaks for urinary OA. Of the 6 HL cats that had detectable urinary OA peaks, 3 had values of <5 microg/ml.
Conclusions:
Apparently, OACR does not increase significantly in cats with HL.
Clinical Relevance:
Urinary OACR is not a useful diagnostic test for HL in cats.