Fur regrowth can happen for other reasons like lighting changes, or increased darkness, or melatonin while an adrenal growth remains. The TN Panel gets false negatives at times but false positives do not tend to happen with that test. BTW, if your vet sends TN Panel tests through Antech or another lab that adds a lot to the cost. If you go to the miamiferret site in my sig lines, open the adrenal section, and then open the adrenal panel test section you can get to the TN U lab with info on how to submit it directly. The test itself is about $65, then there is the shipping which for us in central NJ is about $15, and the cost of blood draw, medical waste, processing it at vet hospital so that it is not whole blood, etc. Doing it that way saves a good chunk of money usually but most vets do NOT know that they can send it directly. So, for next time, if your vet does not always send directly, this will help you. Sukie (not a vet) Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/ http://www.ferrethealth.msu.edu/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html all ferret topics: http://listserv.ferretmailinglist.org/archives/ferret-search.html [Posted in FML 6557]