FoodPrint® 40FoodPrint 40 How does the test work? The CNS FoodPrint 40 service utilises a new, state of the art immunoassay based on microarray technology to detect food specific IgG antibodies. Food extracts are 'printed' onto nitrocellulose pads on a glass microscope slide, together with calibration standards and controls. A blood sample provided by the patient is diluted and dispensed onto each printed microarray. Food IgG antibodies, if present, bind to the