@Wyorp Rock
I find it really hard to believe that there are not labs in the USA that do this service. The one I mentioned has done equine worm egg counts for many years but just started offering the poultry service in the last few years. It surely has to be a good business opportunity as more and more people are keeping chickens as "pets with benefits" and are interested in maintaining their health and longevity rather than purely production, but also not wanting to pump unnecessary chemicals into their birds or the environment.... or waste eggs due to withdrawal periods. It seems odd that no one in the US has cottoned on to this concept.... you must have labs that do equine samples across the pond. It is certainly easier than pestering vets to find one that will check a chicken sample without an appointment and no doubt, a good bit cheaper.
By the way, many congrats on your Educator Badge..... I only just noticed it.... very well deserved, I have to say.
It's a puzzle for sure

Now, other states I can't say what services are provided - I have seen necropsy pricing well over $250 which is just plain out of line - a lot of states only have 1lab as well.
I agree, it could be profitable for someone - chickens are popular right now, so hopefully it will start a trend for vets to be more accommodating and open their doors. But, for a lot of people, testing and/or seeing a vet is just too much $$$.