The medical test for gluten is woefully inaccurate. The best way to test is to have absolutely no gluten for a week or two, then eat something that has it, and see if you react. I don't know about MSG (monosodium glutamate) testing--But I also get headaches from MSG, along with light-headedness and confusion. I usually cook my own Asian cuisine if I'm hungry for it (most soy sauce also contains gluten, believe it or not)