Evaluating serum chemistry profiles may help you diagnose this disease.
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“Serum chemistry profiles reveal that many cats with FIP have elevated serum total protein concentrations because of the high globulin concentrations; however, even with normal total protein concentrations, a decreased albumin-globulin ratio may be evident. As this ratio approaches 0.5, a diagnosis of FIP becomes more likely.”
-Melissa A. Kennedy, DVM, PhD, DACVM
From An update on feline infectious peritonitis