So sorry to hear about your lovely cat
The sedation for X ray sounds incredibly expensive - I used to have a horse and when the vet came out to sedate him it was expensive as he needed so much but nowhere near that
We had a moggy with suspected FIP, have the vets taken fluid from the abdomen?
Ours was booked in for an ultrasound where presumably they'd look for fluid - I'm wondering why they did X rays unless it's because it was because they were investigating for other things - AC had a tummy like a water balloon and had incurred weight loss and wasn't eating and had frequent bouts of diarrhoea, so they suspect FIP based on the consultation, the ultrasound was to follow this up.
Really hope it isn't FIP and it's just a reaction to the vaccine (AC went very wobbly after a wormer once, but that was about an hour after). It's an evil condition and I hope they can find a cure for it
I've just found an email from my vet about it and the next step was to do an ultrasound to draw fluid and examine his organs to see if they were consistent with the fluid buildup FIP gives, likely no sedation needed.
The costs were very reasonable, although we're subject to increase if the samples needed sending to the lab for testing
I can only think the costs are still much (though definitely query the sedation that's extortionate) as they were having to look for a variety of causes - at this point the suspected FIP was already quite advanced in AC, and he'd been showing several classic signs of FIP and they suspected it during his consultation - he'd also been a few months before due to going blind in one eye and had always suffered with diarrhoea