– Tests for the determination of specific IgG (immunoglobulin G) antibody are usually offered on the market, which measure the amount of this antibody in the blood in response to various food proteins. Other pseudoscientific tests such as the IgG4 test, the cytotoxic (or leukocyte functional) test, and hair analysis using bioresonance or kinesiology methods can also be found on the market. Commercial providers of these tests claim that a high reading indicates a sensitivity or intolerance to a particular food.
