Cow’s milk specific IgG antibody level 3 indicates intolerance to cow’s milk, and may be moderately allergic to cow’s milk proteins, which can be further diagnosed by laboratory tests for allergens. Food Specific IgG Antibody Test (IgG Test, commonly known as Food Intolerance Test) is used to diagnose clinical type III allergy-related diseases and provide dietary adjustment reference by detecting the levels of IgG antibodies specific to various foods in human serum. Cow’s milk-specific IgG antibody level III indicates intolerance to cow’s milk and possibly a moderate milk allergy. Cow’s milk allergy means that the body lacks the ability to digest the proteins in cow’s milk, and the proteins in cow’s milk may enter the body in an undigested form, thus causing allergic reactions in the skin, gastrointestinal tract and respiratory tract. So milk allergy try not to drink ordinary milk, need to choose according to the degree of allergy moderately hydrolyzed, deeply hydrolyzed or amino acid milk powder.