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Arah2 level to pass a food challenge?

My almost 3 year old has been scheduled for a peanut challenge. Current arah2 number has declined to .22 with past history of anaphylaxis.
Does anyone know the number that determines if a patient could safely pass? Or has anyone passed a food challenge that can enlighten me? Thank you.

By GailMail on Thu, 12-31-15, 03:35

Yes, that is very low. Allergies are unpredictable but: "Your allergist’s recommendation to proceed with an oral food challenge once your daughter’s peanut IgE level drops below 2 kU/L is based on research showing that the chance of passing a peanut challenge is greater than 50 percent at levels less than 2."

http://allergicliving.com/2013/10/25/do-blood-test-results-show-allergy-likelihood/

By GailMail on Thu, 12-31-15, 03:36

A food challenge is a must with that low of a number. Dr Zachary Jacobs: "I have seen a kid with a peanut IgE of 12 and ara h2 IgE of 5 pass his challenge with flying colors. I have also seen a kid with a walnut IgE of 0.6 fail a challenge on the first dose."

http://www.kcallergycenter.com/blog/2015/8/14/why-i-still-perform-oral-immunotherapy-to-foods

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