Diagnosis of FIP in Cats

Here we have listed tests that can help a veterinarian diagnose FIP in a cat.
FIP may be considered more likely based on the following clinical features and examination findings:
  • Cats are showing clinical signs compatible with FIP
  • Cats are in a higher risk category (e.g., younger cats, colony cats, etc.)
  • Typical changes are seen on routine blood tests – these may include
  • Lymphopenia (low numbers of lymphocytes, a type of white blood cell)
  • Neutrophilia (increased numbers of neutrophils, a type of white blood cell)
  • Anaemia (low red blood cells)
  • Elevated globulin concentrations (one of the major groups of proteins in the blood)
  • An albumin to globulin ratio of < 0.8 raises the suspicion of FIP in a young cat. It’s important to note that no single laboratory abnormality will occur 100% of the time. If the albumin to globulin ratio is < 0.4 then there is a > 90% likelihood that the diagnosis is FIP
  • Elevated liver enzymes (eg, ALT, ALP)
  • Elevated bilirubin (and jaundice or yellowing of the gums and eyes)
  • Further analysis of proteins in the blood (e.g. measuring the protein acid-1-alpha glycoprotein [AGP])
  • Ultrasound examination of internal organs
  • MRI scans of the brain
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