http://www.pennhip.org/PennHIPFAQ.html#HowOldSeems a bit pointless to me, because a dog x-rayed at just 16 weeks of age would NOT have an official hip score in the UK. Unfortunately I have learnt not to trust people. In Persian (and Exotic and Selkirk) cats, we have a genetic kidney disease which can now be DNA tested for. For the results to be official, it has to be done under the FAB scheme, which for instance means that a VET must take the DNA sample to send off. Some breeders save money by doing the testing themselves (after all, to get DNA all you need is a cheek swab) and send it off to US or Australian labs. That way the results are not official as no vet took the sample, and more importantly no vet checked the cat's microchip. Hence no official certificate can be gained. That has had the result that a few unscrupulous breeders have tested cats under false names, and have ended up breeding and selling positive cats, claiming they were negative. So in my view, nothing that isn't official is worth anything as its accuracy cannot be proved.