@Shaz1208, I agree with
@catapillar and
@Jaylee above. Get the boy back to the clinic as the bg measures you have show already consistent (too) high and prolonged bg levels after food intake. I am actually flabbergasted that the specialists in diabetes themselves have not exposed him to a direct glucose tolerance test right away. Binge sodapop drinking and sweets eating will get normal persons to go above 'normal' blood glucose (bg) levels during some short spikes of time. And you also have some rare conditions that may give you increased bg levels or sugar in the urine. But from your testimonies above, I would unfortunately point towards diabetes as the most possible root cause. Don't know if there was any special background for his first urine test done identifying the sugar, if he had been vomiting, feeling nausea or similar? Do you have his weight trends over the past 6-12 months?
The clinical metrics typically used to diagnose Type1 in children are:
1. The random blood sugar tests, which I think you are doing now. A blood sample is taken at a random time. Regardless of when your son last ate, a bg level of 11 millimoles per liter (mmol/L) or higher suggests diabetes.
2. The glycated hemoglobin test (HgAc1) will indicate your son's average blood sugar level over the past 3 months. An HgA1c level of 6.5% or higher on two separate tests indicates diabetes.
3. Start fasting from 8pm the evening before, and then measure the fasting blood sugar level at 6am before rising. A fasting blood sugar level of 7.0 mmol/L or higher indicates type 1 diabetes.
In any case, take him to a diabetes clinic as no reason to remain in this uncertain condition for longer.
We don't hope to see you here again on this forum. But if you do get the Dx of Type1 confirmed, then we are surely here to welcome you back with the huge network of diabetics ready to support where we can, both you as parents but also for your son to find and socialize with fellow diabetic kids his own age.
Best wishes and take good care!