This test assesses blood levels of 7 of the most common toxic metals as well as 8 beneficial minerals essential to health. We prefer looking at blood instead of hair for this test because we want to know what is present and active in your body. Hair tissue mineral analysis, while beneficial for some, only shows what your body is currently detoxing out. In many cases, the body's ability to excrete the metals is the biggest issue. By evaluating blood, we can essentially measure your toxicity level and your detoxification status.