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Rockville, MD
A 42-year-old female asked:

Dr ordered blood allergy tests, but i've read these tests are unreliable. if they show food allergies should i believe it? skin testing is negative.

2 doctor answers5 doctors weighed in
Dr. William Lages
Internal Medicine - Rheumatology 68 years experience
Need confirmation: RAST blood tests can be suggestive of some food allergies, but will need to be confirmed by some sort of food challenge to be diagnostic of that food allergy.
Dr. James Ferguson
Pediatrics 46 years experience
Testing is guide: Blood or skin testing both may not correlate 100% with your personal response to a food item. A blood test showing you have high IgE to any food should be respected, since that suggests a dangerous full blown anaphylaxis risk if exposed. A food diary and food challenges based on such testing can help you define your "safe" list, but be aware that can change over time.

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Last updated Mar 16, 2021


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