Not a lot of help, but my plan is to grab a fresh poop and whisk it off to one of the only two vets in town that see chickens. Then deworm as needed if the fecal shows something. Now I just need to manage to see a poop happen when I have a few hours to run it across town. Vet said chicken intestinal tracts are very different than other animals and it really needs to be within a couple of hours to be accurate. Incidentally, they also said they'd have to actually SEE the chicken to prescribe anything if it did have worms, but figured I could find appropriate drugs to order online if I need to treat something. Some people feel ok with a minor worm load in an otherwise healthy chicken but I have little kids that still put things in their mouth and would prefer to be worm free to the extent possible.