The Food specific IgG Intolerance test detects antibodies to over 220 foods, identifying the common culprits and providing valuable information on the unexpected intolerance. The test is performed using the ELISA (Enzyme-Linked Immunosorbent Assay) method. The extracts of the foods used for testing are prepared in a qualified laboratory. Positive and negative controls are run with each patient sample and each food is tested in duplicate, providing accurate results you can trust.