How is FIP Diagnosed
With no specific test for FIP, vets evaluate the cat's symptoms, diagnostics, and rule out differential diagnosis. Despite the claims made by some, there is currently no test that can distinguish between the harmless intestinal coronavirus and the deadly FIP coronavirus. If a cat has what appears to be the wet form of the disease, laboratory analysis of some of the fluid can support a diagnosis of FIP.
In 2019, there are conclusive, definitive tests for FIP, though not all vets are aware of the advancements in diagnostics just yet. It is imperative that you arm yourself with as much information as possible, so you can best advocate for your cat and get a correct diagnosis.
If there is a presumptive diagnosis of FIP, it is also possible to use GS diagnostically. GS will only treat FIP; therefore, if the cat improves while on GS, the diagnosis is confirmed.
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