Thanks for your informative reply - i really appreciate it. Especially the knowledge about the protien vs. the fat, that helps me sooo much to feel better about trying something with say salmon oil, even though the "panel" says she is allergic to fish....do you know if this would apply to "extracts" as well (like the yeast extract).
The panel that was done was done by VARL (Veterinary Allergy Reference Laboratory) and is called a LiquidGold Allergy Test (looking at the document). They did an Extended Foods panel that represensts the levels of IgE antibodies specific to the allergen they are testing for. The panel rates the allergens from a Class 0 (being absent or undetectable) to a Class 6 being an ultra high level. She didn't come in higher than a 2 on all these things, however, i can tell you that after trying a gazillion foods...I have found nothing that she does not have an extreme reaction to within a matter of 3 days (day 1 she is usually shaking her head and going at her ears and her face looks swollen, by day 2 she'll start getting red pimples/pistules all over her head especially above the eyes and scratching like crazy until she bleeds, and usually by the third day she's miserable and sometimes even wheezing and feverish). Sometimes she'll get some symptoms and not the others, other times she'll get everything super fast and really bad. According to the vet, she shouldn't react so strongly...yet she does. i think she is just a sensitive kitty. In fact, she even reacts to the feline z/d dry food, although the wet does not seem to bother her (sadly i think it is nutritional junk just because it's so boiled out or whatever and she hates it LOL). As i mentioned above, even trying her on a single protien with no other ingredients, she still started reacting :-(.
I should also add that my two cats are indoor only, have never been outside, are monitored during eating times (well at least by my and often by the kids, though i'm not home, so err....) so they don't eat each other's food, and i don't use anything else on them - so it definately is a food issue, even if panels aren't reliable....
What i think i hear you saying, is that because blood test allergen panels are unreliable (why?), that perhaps i should go ahead and try some foods with the supposed allergens, in case she isn't really allergic to them....
I'm definately considering making my own cat food or trying the raw, however it really doesn't fit with our lifestyle too much so i really really hope to find something canned that she can eat, especially for times when we can't monitor them as much and put food up, etc...
I don't know if it matters, but she was a rescue cat who had been found on the streets at about 3 1/2 months old, apparently part of a litter that was left in a home when the occupants moved in the middle of los angeles....at least that is the story i got (she was also pregnant at the time, but they took the babies when they spayed her)...so in my head, i figure either the family fed the animals a lot of table food or she dumpster dived (or whatever cats do on the street) and perhaps that is why she has allergens to substances she should have never even eaten before (like peas). Also, her highest levels (the class 2s, are the starches - oats, rice, potato and peas....). But again, i have found that she really does react to isolated things (for instance milk which i let her try, and is listed as an allergen - had her itching and scratching)....
I'm concerned about her, she's lost half a pound during the last year even though her diet is the same, she has crystals in her urine, and her ionized calcium is high, though she didn't show any thyroid issues and i did have them do the additional testing of the thyroid that supposedly gives back a result that when positive, is 95% reliable indication of a cancer somewhere...that test came back inconclusive....
Sorry if i've hijacked this thread - but i sure hope anyone else that has such problems comes across it and maybe doesn't feel so darned alone. Poor thing is only 4 and i just want her to be healthy and comfortable!