IgG / IgG4 food "sensitivity" testing

What this test is

Some clinics offer a blood test for 'food sensitivity.' It checks IgG antibodies to many foods. This is not the same as a true food allergy test. Studies show having IgG to a food is normal. It happens in healthy people who eat that food often. A positive result does not mean the food is hurting you. Using this test to plan your diet can backfire. You might cut out foods you do not need to avoid. It also costs money and can cause worry. If foods really upset your stomach, there are better ways to find out. A guided elimination diet can help. Tests for celiac disease may help too. If you ever had hives or swelling after a food, tell your doctor. That needs a different, proven allergy test.