Mine is always normal at the doctor's until that cute new nurse glides in the room. But it's my blood sugar that has it's mood swings. It can be 90 and 20 minutes later be over 300. They just started me on one of those new fangled digital readers because I hated to stick my finger. Now I wear this bionic thing on my arm and pass a scanner over it 4 or 5 times a day. It even records up to 14 days.
I've been able to train with a Libre Sense glucose monitor, Abbott Medical makes them and they are working on approval as an over the counter device in the states. So far I've learned a few things from it, trying to get a handle on how much and when to take calories on long training runs or rides.
I could see a real benefit for people with blood sugar issues, it'll show trends way before I can feel them, just have to learn to use the data.
This thing will plot data over time and you can tie it to the training data to work out a nutrition plan. We tried it in the lab on the treadmill and it correlates very well with actual blood draws .