@ChemGal -- you have no clue how many people do NOT go to doctor's, avoid them at all costs, and when they do , just go for emergency / symptom management.
Of course it is screened if you are taking care of yourself.
Go figure, sometimes folks with diabetes are people who avoid doctors.
Sometimes folks with other conditions, or who think they are healthy, avoid doctors. My spouse is one of them.
So, yes, if you go to the doctor, and if you get your blood tests done, then odds are it will be caught.
If you don't, it won't, until you are in a controlled space where bloodtests are being done.