Fingers crossed for the results - I think you misheard the vet though MArk, pyometra is a womb infection, I suspect it would be pretty hard for a male cat to have that!! :-) Interesting that he used a 6 week steroid jab, I didn't think they did those, I wonder if they are safe with CRF - did he do the jab before or after the bloods, as steroids can affect blood test readings and give false kidney readings.