Red-1
I used to be decisive, now I'm not so sure...
If there are any suspicious symptoms, I would ask for the TRH stim test. We had a mare who had successive low ACTH scores but absolutely sky high TRH level.
His ACTH was 27.5 earlier this summer, so not low, just not quite cushings at that time. The old owner says he did have an abscess once before, some years ago. That time it took 3 of them to get a poultice on, today he was simply a good boy, so obviously he has grown up a bit!
Just done him for the night, poultice still in place.