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A 29-year-old male asked:

Allergy rast/blood (ige) test reports no milk allergy. is it possible i could still be allergic to dairy? suffering from thick nasal mucus.

1 doctor answer2 doctors weighed in
Dr. John Chiu
Allergy and Immunology 58 years experience
Yes: Either RAST (replaced by ImmunoCap IgE) and prick skin testing can miss some food allergies. I often test a patient to the food itself when the history and test findings do not match. Recently I was about to challenge a young boy to walnut (history positive, skin test negative) when the skin test turned out to be highly positive to the actual nut. Mold & mite allergies are more likely in HK.
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Last updated Sep 1, 2016

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