Nicely put. You can't. The more you learn, the more you disbelieve. LOL.
However, speaking just for myself, we can only go by the resources available, I suppose, and experience, and good advice. More here than in my surgery, I find.
I had a similar experience with the blood pressure, so now I use a home machine and take my blood pressure every morning, same time same place, and keep a record to take to the surgery. My surgery has a blood pressure machine in reception which (a) hurts my arm (2) gives different readings depending how deep your arm is inserted (3) gives mad readings sometimes ... they even give a warning that is the pressure is too high, get it done again by a nurse.And my home machine sometimes plays silly ******* as well ...
I'm treating the whole thing as a warning and a learning experience, and I have never felt better than when I restarted lchf and walking, so all good so far.

Best wishes.
Edited by mod for asterisks