PSA - You know your cat best, trust your gut
I made a post about a week ago about my kitten (Tiny) who had lost interest in playing with her sister and other toys.
Context: I adopted 2 stray kittens who were littermates. They used to play fight constantly (2am zoomies through the house chasing each other) but I noticed that Tiny had lost interest. She'd just hiss and run off if the other one tried tried initiate play. The cats were otherwise getting along: grooming each other, sleeping next to each other, sharing food.
I took Tiny to the vet multiple times and each time they assessed her and said she was healthy. Maybe she was stressed or didn't get along with her sister or was a very chill kitten. I was never reassured - my gut was telling me she wasn't well but what do I know? The vets probably know better than me.
On the day of making my previous post, I took her to the vet again and they said the same thing: she was healthy. But this time I asked them to take bloods.
I got the results back and no, she's not healthy. Her liver function is incredibly high (>700), her WBC and leukocytes are high as well. Antibiotics were started and i can see her returning to herself again. I've never been happier to hear the sound of 2 kittens wrestling and chasing each other at 2am and knocking over things. I'll miss the good sleep but I'm so relieved.
Trust your gut. The vets are well-educated and knowledgeable but you know your cats the best and if you feel something isn't right, you have a right to ask for further tests.