Hello and Welcome to 'Ask A Doctor' service.
I have reviewed your query and here is my advice.
I assume that the initial testing for
food allergies was a skin test, called the prick test. Negative tests are accurate for excluding
food allergy.
However, positive tests can occur in patients without symptoms related to a particular food.
The blood tests were most likely
RAST testing. Some allergists believe the RAST has no advantage over skin testing.
Not too long ago there was a study in the medical journal, Pediatrics,
(journal of the American Academy of Pediatrics) which said that neither skin-prick tests nor RAST testing are diagnostic of food allergy.
What this tells us is that these tests are not perfect to diagnose food allergy.
The best evidence of whether or not your daughter has food allergies is that she has been given these foods and is "totally fine."
You have shown that it is safe for her to eat these foods.
Hope I have answered your query. Let me know if I can assist you further.
Arnold Zedd, MD, FAAP