Nope. It's the blood sugar levels that need to be constantly monitored with blood testing.
The insulin dose is adjusted in the case of a T1 to keep sugar levels at a healthy parameter & avoid the inevitable complications associated with prolonged high BG.
Insulin is calculated in a balancing act involving carb intake to insulin ratio & forecasting exercise ,physical exertion or the respective lack of....
One can also include climate change & insulin integrity too..
Because unfortunately, though we might be able to think like a pancreas. We can't act as fast as one.
In terms of the "man is a machine"..? If the blood sugars swing either way.. For instance regarding this topic a hypoglycaemic episode..
It's safe to put this down in short to "driver error".!