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Question
Posted by: Gina Muray | 2018/05/02

Are RAST testing for food allergies accurate?

I cannot get a skin test right now, so I had to get blood tests done. How accurate are these for food allergies? Can I feel safe following the results if they are negative?

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Our expert says:
Expert ImageAllergy expert
- 2018/05/20

RAST testing for allergies is as accurate as skin prick testing.  They both are about 80% accurate for diagnosing allergies. Their negative predictive value is most accurate, meaning a negative RAST or skin test is likely to be correct. Whereas some mildly positive allergy tests may not be accurate and occur in non-allergic individuals. 

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