I have genetically inherited type 2 diabetes as has my brother. My daughter who has Hashimoto's thyroid disease, and whose glucose levels were raised during her last pregnancy with her daughter, who will be 3 in a couple of months. Having recently registered with a new doctor, she had blood tests. Her blood sugar came back at 6.9. A subsequent test came at 5.1 which is normal. We are unsure if the first result is just an anomaly or could indicate a predisposition for diabetes.
Doctors love to use fasting blood glucose levels as an indication of prediabetes.
I find it very frustrating because such thinking is a tremendous over simplification.
I'm a type 2 diabetic, and my fasting blood glucose varies from 6.2 up to 8.5
Why?
There are so many variables!
Stress
Time of test
Eating habits
Sleep quality
Dream activity
Menstrual cycle
Exercise levels generally
Exercise level on the day before
Various hormone levels...
So, in answer to your question;
Doctors will say: her two tests suggest she may show signs of prediabetes. Come back in 12 months and get tested again.
I say: get her a cheap blood glucose meter (the SD Codefree is the cheapest I have seen) and buy 50 strips. It'll probably cost about £23. Get her to test her fasting BG every morning til the strips run out.
Then average the test results. That average figure will give you a MUCH better indication of where she is on the normal/pre/diabetic spectrum.
If her average is over 7, she needs to go back to the doc and press for an oral glucose tolerance test.
If her average is between 6.0 and 6.9 she needs to think seriously about diet and exercise and lifestyle because she has an increased risk of developing D in the future.
I wish I had been able to do this, but i didn't even know you can buy your own test meter til I joined this forum.