Cats

Cat FIP Diagnosis and Staging

Feline infectious peritonitis (FIP) is now a treatable disease but requires accurate diagnosis and staging to guide antiviral treatment. Understanding the diagnostic process improves welfare outcomes.

Key Facts

FIP diagnosis requires integration of clinical signs, laboratory findings and response to treatment
Wet FIP shows typical yellow viscous effusion with high protein and low albumin:globulin ratio
Dry FIP shows granulomatous lesions often affecting brain, spinal cord, eyes and abdominal organs
The Addie score incorporating multiple parameters helps determine FIP likelihood before biopsy
Response to GS-441524 treatment within 2-3 days provides strong diagnostic confirmation

Welfare Considerations

FIP causes progressive debilitating illness with suffering from fluid accumulation, neurological dysfunction and systemic inflammation. Accurate staging determines whether standard or higher doses of antiviral are needed. Delays in diagnosis and treatment prolong suffering. Vets and owners should act quickly when FIP is suspected as early treatment achieves better welfare outcomes and higher cure rates.

What You Can Do

Seek immediate specialist veterinary advice for any cat showing FIP-compatible signs
Request full diagnostic work-up including effusion analysis and Addie score calculation
Begin antiviral treatment as soon as FIP diagnosis is sufficiently likely rather than waiting for certainty
Monitor treatment response closely and adjust protocols based on clinical improvement
Connect with FIP owner support groups for practical advice on accessing and affording antivirals