With a difficult blood draw, and minimal changes in the blood values,
I would hesitate to interpret them as being definitely diagnostic of
anything, especially of liver disease, which tends to be uncommon in the
ferret.  Doesn't mean it couldn't be, but I wouldn't jump right into
saying that's what it is.  I think repeating the bloodwork, especially if
you can get a clean draw, is a good next step, as is an ultrasound.  As
for which vet you should have do the ultrasound, go with the one you feel
most comfortable with.  Certainly urinary problems in a male ferret are a
pointer toward adrenal disease, but other things, such as bladder stones,
prostate disease unrelated to adrenal disease (infection, etc), tumors in
the urinary tract, or just a urinary tract infection can cause a ferret
to have urinary problems.  Has a urinalysis been done?
 
Dr. Ruth
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Save lives - spay or neuter your pet.
[Posted in FML issue 3805]