>I'm not a vet. However, I have twice had insulin levels and >insulin/glucose ratios run on ferrets with "grey-zone" blood sugar levels >to try to figure out if insulinoma was the culprit. In both cases, >insulin levels and the ratio were in normal range, but the ferret went >on to surgery, where insulinoma was found and successfully treated. I >wish I was qualified to comment on *why* this is possible, but alas, I'm >not. Maybe someone else can explain it... Insulin is released in spikes. The reason a ferret can have insulinoma and still have a normal insulin level is because of that - the blood was just drawn at a time when the insulin release was at a low point. Dr. Ruth ***************************************** Save lives - spay or neuter your pet. [Posted in FML issue 3588]