Professional medical organizations have raised concerns about the accuracy of at-home food sensitivity kits for diagnosing food sensitivity. Food sensitivities, unlike food allergies, occur when the body improperly processes or digests a specific food, causing stomach-related problems, such as gas, bloating, or diarrhea.
At-home food sensitivity test kits reportedly measure levels of the antibody, immunoglobulin G (IgG), in the body and interpret the cause of the levels—often suggesting a rise in IgG levels indicates a food sensitivity. However, physicians and professional medical organizations note that high IgG levels are likely a normal response to exposure to a specific food and do not necessarily indicate food intolerance.
In general, the US Food and Drug Administration (FDA) does not regulate at-home tests used for non-medical, general wellness, or low-risk medical purposes, which reportedly includes at-home food sensitivity test kits. This means the FDA has likely not assessed the accuracy, reliability, or clinical validity of these tests or claims the company who produces the tests make.
Allergy experts and organizations like the American Academy of Allergy, Asthma & Immunology further caution that individuals may unnecessarily remove nutritious foods from their diet in reaction to the results of an at-home food sensitivity test. Physicians often recommend an elimination diet—removing one-by-one common foods that may contribute to sensitivities—to identify potential foods causing digestive tract problems.
If you believe you are suffering from a food sensitivity, reach out to a healthcare provider to receive advice and assistance with properly diagnosing and managing your condition.
 including the American Academy of Allergy, Asthma & Immunology