A test for food intolerance is a diagnostic procedure that helps identify specific foods or substances that a person may be reacting negatively to or exhibiting symptoms from. Often, difficulties with the digestion or processing of particular food ingredients—like gluten, milk, or certain food additives—are linked to these adverse effects. Food Intolerance Testing can take many different forms. Blood tests measure an individual’s IgG antibodies to specific foods; breath tests identify lactose or fructose intolerances; and stool tests look for signs of malabsorption. You can determine the best course of action and guarantee that the results are appropriately interpreted by consulting with a medical expert or experienced dietician before conducting any food intolerance testing.