When I had my food sensitivity testing done, they asked if I just wanted a whole blood workup done, so I said yes. They tested everything from bodily Ph to vitamin/mineral levels in the blood to liver function, etc. It was done through the chiropractor, who sent the blood off to various labs to evaluate it. My physician later accused the tests of being questionable, but I don't know who to believe. In any case, it was a blood test that I got through my chiropractor. Don't know how accurate it is or anything, but it showed markedly low levels of mg. and calcium. The chiro talked to me about it a little bit and gave me some T3 pills for dysfunctional thyroid activity due to a "sluggish liver" and some mg. with malic acid.