Likely because not all every vet got the memo that there's a new IBD blood test available.
http://labs.vetmed.ufl.edu/sample-re...ed-infections/
http://labs.vetmed.ufl.edu/sample-re...ions/boid-ibd/
Because ZOMG if a snake has neuro problems IT'S GOT IBD!!!! ... or another disease... or poisoning from mite treatment... or it was overheated... or a myriad of other reasons.Why are you assuming it's IBD?