The BloodPrint test is an IgG test. You might find this article Testing for IgG4 against foods is not recommended as a diagnostic tool prepared by The European Academy of Allergy and Clinical Immunology. They say "In conclusion, food-specific IgG4 does not indicate (imminent) food allergy or intolerance, but rather a physiological response of the immune system after exposition to food components. Therefore, testing of IgG4 to foods is considered as irrelevant for the laboratory work-up of food allergy or intolerance and should not be performed in case of food-related complaints."
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