RAST TEST

Posted on: Tue, 06/19/2001 - 1:43pm
Super Mom's picture
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Joined: 06/19/2001 - 09:00

How is it that my PA son scores so high with peas when he ate them raw from the garden last summer with no effects? I thought that cooking them reduces the protein, so a reaction is lessened. Last summer I fed him cooked peas (he ate 3) from a can (Green Giant), and my son had the worst reaction (thank God for the Epi-Pen). How can you have a score of high allergic probability when one eats the food raw with no effects whatsoever? Any info would be greatly appreciated!

Posted on: Thu, 07/19/2001 - 9:42am
BCUZILUVHIM's picture
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Joined: 03/17/2001 - 09:00

Hi Carjen! Is it an ImmunoCAP RAST or a regular RAST? ImmunoCAP is measured in kU/L and the RAST is measured in IU/mL.
A 0.37 in an ImmunoCAP falls in the Class I range which is considered a low positive. The classes go up to VI.
A 0.37 in a RAST test falls in the around the mid Class II. which indicates increasing levels of specific IgE antibody. Again the class goes up to VI.
The immunocap is a more specific test and it will tell you with 95% certainty that there will be a likelihood of a reaction. Not the severity but the likelihood.
My son was tested 3 weeks ago and they accidently did a RAST and not an ImmunoCAP Rast as I and the Dr. had requested. The Rast came back a 51.89(putting him in Class V almost Class VI) Waiting on the results of the Immunocap, my Dr. called the lab yesterday to have them re-run the test with the ImmunoCap. Best wishes!! Fran [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]

Posted on: Fri, 07/06/2001 - 12:30pm
BCUZILUVHIM's picture
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Joined: 03/17/2001 - 09:00

As my sons' allergist has explained to me, there are many variables that are in the mix when it comes to reactions. What did they eat with or just before the offending food, what time of day was it, where they running around playing or were they sedentary. The allergist actually said that there is no logic to any of these allergies and he could give my son a peanut right now and he could have no reaction and then give him a peanut 2 days from now and it would be lethal. It depends on the different variables. Did they eat the offending food during a season where the cross-reactive environmental allergen was high etc...etc... You see you will never know how they react UNTIL they react. It will probably be different every time. Good Luck!!

Posted on: Mon, 07/09/2001 - 12:49pm
Super Mom's picture
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Joined: 06/19/2001 - 09:00

Thanks for your replies.
CLC, my little guy had no other foods with his meal that would cause a reaction (hot dogs, home fries). I called Green Giant and they do add unlisted preservatives and they cook the peas at an incredibly high temperature. I don't trust pre-cooked canned veggies any more. Just another thing for us to deal with.
Bcuziluvhim, thanks for letting me know that I'm not the only one who's totally confused. My son's allergist said similar stuff that you wrote. But I am way out in left field when you talk about cross reative environmental allergens. The episode occurred at the end of July last summer (which is the beginning of Ragweed season in my area of Ontario - I have terrible seasonal allergies to that plant and its family). I never thought of that. I'll look into that more thoroughly.
Thanks a million! [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]
Michelle

Posted on: Fri, 07/13/2001 - 5:48am
Anonymous's picture
Anonymous (not verified)

I do know that many allergists and all of the documents that I have read stated that you do not normally react to your first exposure to an allergen. Your body is sensatized the first time and reacts with the next ingestion. This held true with my son and cashews. He consumed two handfuls of cashews a few years ago and last year had an anaphylactic reaction to three small pieces of cashews. At the time we suspected PA but had not been confirmed.

Posted on: Fri, 07/13/2001 - 1:35pm
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Joined: 05/01/2001 - 09:00

IN April our 14month old son was eating cooked frozen Giant brand peas and a Hebrew National Hot Dog when he had a reaction. That's when we discovered that peas and peanuts are legumes. He had been eating baby peas from a jar for months before and the same frozen peas once he was 10 months old so who knows why or how this allergy developed. He also showed signs of reaction to green beans a few weeks after that. We have not tested him yet for these specific legumes. That's coming in August.
We do know he is ok with soy. So who knows how and why these allergies develop.

Posted on: Sat, 05/24/2008 - 2:47am
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Joined: 01/16/2007 - 09:00

yes, I beleive you can. You have to have been exposed or sensitized to the allergen to test positive for it. So in theory if they have never been exposed to other nuts at all. you wouldtest negative in a blood test. Art least that is my understanding.... I could be wrong though

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