Like "Diabetes is diagnosed with a fasting reading of 126 or higher, a fail on the oral glucose tolerance test or a random blood test of 200 or more that's accompanied by symptoms. That being said, there are a number of studies in non-diabetic people that show they never get above 140 and that 140 is after an extreme carb load and is only for a very short period of time, most were under 100 all the time. With blood sugars up to 155 he has a problem, only a doctor can tell what that problem is. Does he take medication? Does he eat a low carb diet?"