A few years ago I had a doctor suggest I have Genova testing done to determine what health problems or sensitivities I might have. It was expensive. My take away from the info was that the tests used dna. It was awhile ago so my recollection isn’t that clear. Links to websites I found typing in Genova.
https://www.gdx.net/
https://www.walkinlab.com/categories/view/kits/genova