What is the difference between IgA/IgG and IgG4/C3D on the Food Sensitivity test?

IgA/IgG testing measures IgA and IgG antibodies to specific foods to identify sensitization. IgG4 antibodies and C3D component testing identifies the pro-inflammatory, complement system-activating, and autoimmune potential of sensitive foods. For more information, see the attached Food Sensitivity IgG4-C3d One Pager.