I also had the Melisa blood
test for metals, which showed I have a mild metal allergy to both titanium (4.1) and titanium dioxide (3.5). No other metals tested positive.
I have stopped intake of titanium dioxide (it's everywhere--in pill/vitamin/candy coatings, toothpaste, gum, hair dye, cosmetics, cigarette paper, cigarette filters, some cheeses/soup, etc). In food/medicine ingredients, you see it as titanium dioxide, E171, or CI77891. Its chemical name is TiO2.