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Vet Rec. 1997 Sep 20;141(12):299-303.

Value of alpha 1-acid glycoprotein in the diagnosis of feline infectious peritonitis.

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Department of Veterinary Clinical Studies, University of Glasgow Veterinary School.


Feline infectious peritonitis (FIP) is notoriously difficult to differentiate from the many other diseases with similar clinical signs and at present the only conclusive diagnostic test is the histopathological examination of a biopsy. The potential value of raised levels of the acute phase reactants, alpha 1-acid glycoprotein (AGP) and haptoglobin in the diagnosis of the disease was investigated. The concentrations of the two proteins were determined in serum samples from healthy cats and gave reference ranges of 0.1 to 0.48 g/litre and 0.04 to 3.84 g/litre, respectively. Levels of AGP greater than 1.5 g/litre in serum, plasma or effusion samples were found to be of value in distinguishing field cases of FIP from cats with similar clinical signs and differentiated these two groups of cats more effectively than the albumin:globulin ratio. The concentration of haptoglobin was higher in cats with FIP than in the group of healthy cats, but this protein was not of value in the diagnosis of FIP. Serum samples from feline immunodeficiency virus-infected cats were also analysed for these proteins and their concentrations were significantly elevated, illustrating that raised levels of AGP and haptoglobin are not pathognomonic for FIP.

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