[This is the SERUM version of the test, it is also available in an at home BLOOD SPOT version] The FIT(Food Inflammation Test) is a patented, multi-pathway delayed food sensitivity test. The test uses an approach of measuring IgG1-4 as well as Complement activation via the marker C3d, a true marker of inflammation. The test uses new technology that measures both IgG and Immune Complexes, the most common food-related pathways in the body. The FIT Test measures sensitivities to up to 132 different foods and additives spanning all major food groups. The company has found that by measuring these multiple pathways, it enables them to eliminate false positives commonly associated with IgG only testing. This enables them to zero in on specific key foods and the company typically sees 5-15 food sensitivities per patient.