I was reading our club newsletter and they had 3 letters written by vets for layman on Insulinoma. In one regarding Islet Cell Tumor ("also know as insulinoma") it says: Animals with blood glucose levels less than 60 mg/dl should strongly be suspect of having on or more of these tumors. He does not mention fasting or anything. Next letter: The disease is easily diagnosed with a fasting blood sugar test. You need to withold food for 4 to no more than 6 hours prior to the test. Normal fasting sugar should be between 90-120. So now I'm confused. Fast or not fast? 60 or 90-120? Any help out there? Vets? Mary [Posted in FML issue 2202]