I myself would like to know precisely what guidelines breeders are asked to follow before placing a kitten to a new home. What tests are required and preformed for the breeder to use the verbage "healthy cats". Is their a difference between what the breeder is REQUIRED TO TEST FOR & what a true breeder in love with what he or she does and goes the extra mile to ensure the highest quality of health of the kitten before placement.
I don't think that there IS any specific requirements, although I think that some states have laws on this. I seem to remember something about Florida having a pet lemon law that could be used. But generally even in those cases, you would have to take them to court and only get back the purchase price which often won't come close to what the vet bills for that kitten might be.
TICA has a Responsible Breeder Program which is voluntary, so you could ask if they have signed that voluntary code of ethics...
So yes there would be a big difference between what is "required" and what a responsible caring breeder might do. I personally require my kittens to have been to the vet twice for a health check (and hence their hearts listened to), two FVRCP vaccinations and microchip. I test all cats in my program for HCM (via cardiac ultrasound) and PK Deficiency (via DNA testing). I have tested all cats for FIV/FeLV but also test each litter of kittens (because I am slightly paranoid). It's definitely expensive to go that extra mile you mention!
I think it pays to have a conversation with the breeder BEFORE you put down any deposits or sign any contracts on what they do to ascertain their cats' health. And always read the contract carefully before sending any money too! We often get asked to get involved after something goes wrong, but often the situation is not covered by the contract, &/or the buyer thinks that they can have a refund of the purchase price when almost all sales contracts only offer a replacement kitten if certain conditions are met.