Hemopet Food Sensitivity Test

I was thinking of trying this for Mocha who has eosinophilia granuloma. She has it on her lips again. If it’s from protein she can’t eat beef, chicken, turkey, or pork. I called hemopet and she said maybe it’s what they feed the animals. I checked with Primal and there’s are grass fed, no corn. It’s not cheap to get the test if it’s fake. I don’t see any testimonials for cats let alone for what she has. Another thing is they need to get 2 ml of saliva. It says to keep the rope in her mouth 2 minutes. I doubt I could keep it there 10 seconds. I also contacted Balanced Blends to see if their source for protein is grass fed. Their food doesn’t contain any fruit or vegetables. Then if grass fed what if it’s wheat grass. Any ideas?