My T1 mother (who almost died of DKA before she was diagnosed in her early twenties) took me to the doctor for tests when I woke in the night asking for water several nights in a row. So I got diagnosed unusually early. These were the days when the only form of blood sugar testing was a chemistry experiment to tell you how much sugar was in your urine. (A positive result indicated a bg over 10mmol/L)
As an adult whenever I worried that my children were showing signs of diabetes I used urine testing strips. I figured that if they were diabetic they would start passing sugar into their urine and that would be a sign I should take them to the GP. (I also figured I'd have a mutiny if I tested their blood sugars too often.
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I can imagine you are very worried but even if we were allowed to diagnose (which we aren't) I don't think you have enough data to make any predictions yet.
says you need a random bg over 11.1, two hba1cs over 48mmol/l or a fasting bg of over 7.0 mmol/L . And remember that non diabetics can get occasional higher blood sugars and also blood testing machines aren't always accurate.
If it's any help, my teenage son once had a slightly higher than normal bg at the GP and they did a glucose tolerance test, which he passed. Now he's 33 and still not diabetic, so though I reckon he might get T2 one day (3 T2 grandparents) the risk of
childhood T1 is well and truly over.
You know your child so I think you are right to see the GP if you are worried, though.
Good luck. I really hope she doesn't have diabetes but at least if she does she'll be diagnosed very early and have family members around her who already understand how to treat the disease.