It is not necessary to fast a ferret for glucose testing, for a ferret with insulinoma it is also dangerous. http://www.afip.org/ferrets/PDF/insulinoma.pdf extract from above... >The practice of fasting prior to blood glucose test is controversial, >especially during initial workup for hypoglycemia. The majority of >insulinomic ferrets will exhibit hypoglycemia without fasting, and >may be thrown into a crisis situation following a fast.. Tony (not a vet), Sugar and Suki. In memory of Sally and Sue. [Posted in FML 5930]