P88 Dietary Antigen Test (Serum) is one single test combining IgE, IgG, IgG4 and complement (C3d) reactions to 88 of the most common foods found in the diet. Precision Allergy 88 (previously 588 + Dietary Antigen Testing) was the first test on the market to measure and report immune complexes containing C3d. Complement activation is well-defined in the research as not only a cause of inflammation, but one of the strongest causes.