This is where the IgG food sensitivity test can help. It checks how your immune system reacts to different foods by looking for a specific antibody called Immunoglobulin G (IgG) in your blood.

Total IgG levels were determined in serum samples pretreatment and again 2 weeks after treatment. Some patients also had IgG levels measured at 4 weeks (91 patients), 3 months (86 patients), and 6 ...