I don't want to give you false hope but it is mis diagnosed a lot. There is another thread on this I have been posting to. I work a lot with Ferals and fip is an everyday thing sadly.
Here is a web site that may help below. first find out if it is fip.
Any way here is the website.
http://www.ehow.com/how_4629674_tell-cats-fip-diagnosis-accurate.html
here is some of the info I am putting it here so other read it also. So many people are mis=informed about this very scary virus. i am also putting it here because when my suzie was sick and people posted urls i followed some of them but nit most. there was just to much going on to much info.
More cats are euthanized due to a misdiagnosis of Feline Infectious Peritonitis (FIP) than due to a correct diagnosis. If your cat is diagnosed with FIP, it is your responsibility to find out if the diagnosis is correct. Many cats are put to sleep or allowed to suffer from an unrelated disease because of a misdiagnosis of FIP. Use these tips to assess whether the diagnosis of your pet is likely to be accurate. If there is even one sign which does not line up, getting a second opinion can save your kitty's life.
Instructions
things you'll need:
your kitty's blood test results
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1) POSTIIVE FIP TEST (TITER > 1:160) - Most misdiagnoses occur because of the FIP/FCoV Test. A positive score on an FIP test does NOT mean your kitty has FIP (the only true way to diagnose FIP is through biopsy). The misnamed "FIP TEST" actually tests for antibodies to the common Feline Coronavirus which 50-90% of cats in multi-cat households have. FIP is a mutated form of this virus and tends to effect kitties with low immune systems. This test is really only accurate by itself when used on a healthy cat to distinguish if it is carrying Coronavirus before introducing it to a cattery or as a breeder. It is 1 of the signs that your kitty COULD be carrying the mutated form of the CoronaVirus - FIP.
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2) HIGH GLOBULIN LEVEL > 5.1 gm/dl - Cats with FIP commonly have high globulin levels. This is one of the critical indicators that you can check by looking at your kitty's blood test results.
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3) LOW LYMPHOCYTES - Check your kitties lymphocyte level. Low lymphocytes are an indicator of FIP.
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LOOK AT THE STATISTICS: If your kitty does NOT meet EVERY single one of the three above criteria (POSITIVE FIP/FCoV, HIGH GLOBULIN, LOW LYMPHOCYTES) there is a 98.8% chance that your cat does NOT have FIP.
If your cat does meet all of the three criteria there is an 88.9% chance that your kitty is correctly diagnosed with FIP.
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LOOK AT ADDITIONAL INFORMATION: If your cat does not meet the three criteria, get a second opinion immediately to find the correct cause of your kitty's illness. If your kitty DOES meet the criteria, there are more indicators you can look at. First is the ALBUMIN-GLOBULIN RATIO. If the albumin to globulin level is less than 0.8, there is a 92% statistical chance that the cat has FIP. If the ratio is greater than 0.8 there is a 61% chance the cat does not have FIP.
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ADDITIONAL SCREENING TESTS - Most cats diagnosed with FIP are diagnosed based on a positive Titer score (which we know is not reliable). If your cat's diagnosis appears to be correct due to his blood tests as well, you may want to get a second more reliable test as a confirmation. In the resources section is a link to an online FIP support group. They will have recommendations regarding additional tests. One little known test is Rivalta's Tests. A negative Rivalta's test is 97% accurate in ruling out FIP. A positive test is 86% accurate in ruling in FIP. Another option if your cat is diagnosed w/ wet/effusive FIP is to get chest fluid drawn/tested. A different option is Immunofluorescent Coronavirus Staining of the Effusion. This is 100% accurate if positive, unfortunately if it is negative, there is only a 57% chance that your cat does NOT have FIP (so high percent of false negatives).
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STAY CALM AND INFORMED - When your veterinarian tells you your loved kitty has FIP it is natural to feel devastated. Arm yourself with information, so you can make the best choices for your kitty. No matter what happens, FIP is not your fault! A lot of people are going through your situation. Use support groups to your advantage! When my kitty was diagnosed with FIP, I had over 20 loving responses within the night on 2 cat forums. Good luck. I hope this article has been helpful and I wish the best for you and your family!
Read more: How to Tell if Your Cat's FIP Diagnosis is Accurate | eHow.com
http://www.ehow.com/how_4629674_tell-cats-fip-diagnosis-accurate.html