FIP Diagnostic Workflow
A step-by-step evaluation framework for suspected feline infectious peritonitis (FIP). Use this page to understand what to track, what tests are commonly used, and how results are integrated in clinical practice.
Important: All content is provided for educational purposes only and does not replace professional veterinary diagnosis or care.
Workflow Steps
Click any step to open the detailed page
01
Baseline Monitoring
Track temperature, weight, appetite, hydration, and behavior trends.
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02
Blood Tests
CBC, total protein, globulin, A/G ratio, liver/kidney markers.
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03
Imaging Studies
Ultrasound/X-ray to identify effusion, organ changes, lymph nodes.
🖥️
04
Abdominal / Pleural Fluid Analysis
Appearance, protein, cytology, Rivalta test, rule out infection.
💧
05
Differential Diagnosis
Exclude look-alike conditions (infection, cancer, organ disease).
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06
Integrated Clinical Assessment
Combine symptoms + trends + tests to estimate likelihood and next steps.
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Key Tests at a Glance
Commonly used items during evaluation (educational)
CBC
Anemia, lymphopenia, inflammatory patterns
Total Protein / Globulin
Hyperglobulinemia supports inflammatory disease
A/G Ratio
Lower ratios can increase clinical suspicion
Ultrasound
Effusion, organ changes, lymph nodes; guides sampling
Effusion Analysis
Appearance, high protein, cytology; Rivalta when used
Rule-Out Testing
Exclude FeLV/FIV, infection, cancer, organ disease
How Results Are Integrated
Patterns + trends matter more than single numbers
What Clinicians Look For
- Consistent symptom patterns (fever, weight loss, lethargy)
- Persistent inflammation and protein imbalance trends
- Effusion features that support inflammatory disease
- Multisystem involvement (abdomen, chest, eyes, nervous system)
- Exclusion of look-alike diseases through structured rule-outs
Common Pitfalls
- Relying on one test result in isolation
- Assuming antibiotics “rule out” FIP
- Ignoring trend data (weight/temperature logs)
- Overlooking cardiac/liver/kidney causes of effusion
- Delaying imaging or fluid analysis when effusion is suspected
When to Seek Veterinary Care
Urgent signs require prompt professional evaluation
Seek urgent veterinary attention if you notice:
😮💨 Breathing difficulty / rapid breathing
🧠 Seizures, collapse, sudden inability to walk
💧 Rapid abdominal enlargement
😿 Severe lethargy or unresponsiveness
For non-urgent concerns, use the self-check and bring logs/reports to your veterinarian.
FAQ
Short answers (educational)
Can blood tests confirm FIP?
No. Blood tests can support suspicion and guide next steps, but confirmation often requires integrated clinical assessment and, when applicable, fluid analysis or advanced diagnostics.
Is ultrasound always necessary?
Ultrasound is highly useful for detecting effusion and organ changes and can guide fluid sampling. Your veterinarian will determine whether imaging is indicated.
Can other diseases look like FIP?
Yes. Many infectious, inflammatory, neoplastic, and organ-related disorders can mimic FIP. Differential diagnosis is essential.
References & Medical Disclaimer
Authoritative sources (educational)
- Cornell University Veterinary Medicine
- Merck Veterinary Manual
- VCA Animal Hospitals
- ISFM (International Society of Feline Medicine)
- AAFP (American Association of Feline Practitioners)
Medical Disclaimer
Important: All content is provided for educational purposes only and does not constitute veterinary diagnosis, treatment, or medical advice.
Always consult a licensed veterinarian regarding your cat’s health and medical decisions.