The legal aspect you will run into when wanting a vet/vet office to check a sample- is if they are going to recommend a treatment or prescribe a treatment- they need to actually see and touch your pet. It is called a 'current patient-doctor relationship'. What some vets will do to somewhat circumvent this in specific cases, is allow the sample to be run- and give you the results- and then you can do what you want with them (ie look up what to buy from the feedstore on your own). The best place to go is a vet you like that you already have a relationship with- like the more common dog & cat place, if you take other pets somewhere. Or see if you can find one that will work with your birds as a 'flock'. See one bird occasionally, and help with the flock. UCDavis has a whole poultry department, as well as an exotics department at the vet school that will see birds of all types- but yes, that would be a day trip for you. This is also where to send a deceased chicken for a free necropsy if that ever is needed.
Most vets can run fecal floats in-house, but many also routinely send them to an out-lab with better equipment. Most places would prefer to send out non dog/cat fecals to an out-lab as identifying the parasite eggs correctly is not easy beyond the more common ones. So yes- a vet hospital can run a fecal float on a chicken poop- but the sample will probably get send out to a reference laboratory- so you get your results in 24 hrs, not 30min.....
Most vets can run fecal floats in-house, but many also routinely send them to an out-lab with better equipment. Most places would prefer to send out non dog/cat fecals to an out-lab as identifying the parasite eggs correctly is not easy beyond the more common ones. So yes- a vet hospital can run a fecal float on a chicken poop- but the sample will probably get send out to a reference laboratory- so you get your results in 24 hrs, not 30min.....