The only (possible) sign of ulcers that will show up in a fecal sample is blood if they're bad enough to cause internal bleeding
The sort of encysted worms that cause enough pain to make a horse girthy also rarely show up in a fecal sample
A full blood test might have been more useful as the encysted worms and ulcers can both cause anemia
Hope you can sort something out
I understand that Jaydee, which is why he's getting wormed with Moxidectin and will be treated for ulcers. The only question is whether it's a severe infestation that would show up in a stool or not. Basically, the vet says scoping is no more revealing of ulcers if they're not in the stomach so the stool sample is a much less invasive way to see if we can pin something down. But even if absolutely nothing shows up, he is still getting treated.
You might wonder why I'd bother doing it at all... like I said, I don't like not knowing and I don't like randomly treating for things. If there a slight possibility that this will give us answers, then it's not outrageously expensive to do and it's completely harmless to Harley. If I don't get any answers from this, then we'll still worm and treat for ulcers, though less aggressively.
On another note, as I was waiting around for him to grace me with a stool sample, I noticed that when it finally did come, it was very liquid again. Like pure liquid at first - a brownish red. So there could be some blood. After the liquid was a very wet stool, like cow patties, then finally a few balls. Sorry for the description, but this has me worried. If we don't find anything to explain this in the stool sample, I will talk to the vet again. Blood work may very well be coming next.