Someone I met who is very interested in alternative and preventative medicine told me that fasting insulin is as important as glucose levels. She said the way it was explained to her is that your glucose can be okay, but it may be because your pancreas is working overtime to pump out enough insulin to keep it that way, but sooner or later, your pancreas will start to wear out, can't keep up, and that's when the glucose goes up.
https://headsuphealth.com/blog/self-tracking/low-carb-lab-testing-part-3-homa-ir/#:~:text=Ideally%2C%20the%20doctor%20will%20create%20a%20lab%20order,to%20consider%20ordering%20this%20test%20on%20your%20own