If your concern is coccidiosis, and you're already seeing possible symptoms, I wouldn't bother with testing/vet visit for it. Better to just treat the whole flock for it. Corid is pretty safe to use and a severe case of coccidiosis can kill a chicken very quickly, so when it comes to coccidiosis better to be safe than sorry.Okay but once the fecal testing is done, do you just treat it with corid?
Worms are a different matter. That's what the fecal would be checking for, what types of worms they may have and how heavy the worm load is.