RAST/Food challenge/so confused....

Posted on: Wed, 12/20/2006 - 3:44am
tigganroo's picture
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Joined: 04/26/2005 - 09:00

So I used to come here all the time. I hope you all don't mind me just jumping back in and asking for help.

My dd has outgrown her milk, egg, and soy allergy. We are just left with the peanut. I just got her RAST back today and they said it was negative. Her last skin prick was about 7-8 mos ago (and it was positive). They want her to come in to the hospital for a food challenge Friday morning. I was one very excited momma. Then I came here to read up on food challenges, and stumbled across the threads about RASTS...from what I'm reading many ppl say that they aren't a good measure.

I'm so confused. The dr. wants to do a food challenge...and now I feel like I could be causing her more harm then good. I'm very nervous now. I don't want to cause her harm.
The only reaction she has had is a skin rash around her mouth from pb cereal at about 14mos.

agh!
I don't know what to do.

Posted on: Wed, 12/20/2006 - 5:52am
SallyL's picture
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Joined: 02/20/2006 - 09:00

We've never had a food challenge, so it hasn't come up for us, but I've read that alot of allergists will do a skin prick test just prior (or at a prior appointment) to doing the food challenge. I guess that's a little more accurate? Or at least a double check measure.

Posted on: Thu, 12/21/2006 - 3:40am
tigganroo's picture
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Joined: 04/26/2005 - 09:00

thank you very much for your response. I know this board probably gets the same questions all the time and ppl get tired of answering them so I really do appreciate it, thanks!
I have since called the dr and expressed my concerns and we will be doing a skin prick test first. [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]
I don't want to get my hopes up...but oh what a wonderful Christmas miracle this could be....

Posted on: Thu, 12/21/2006 - 8:19am
mckennakatesmom's picture
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Joined: 09/07/2004 - 09:00

Hi,
I posted last night, but my 19 month old turned of the computer as I was finishing and I didn't get a chance to re-type the whole thing until now.
My dd is 4 1/2. She passed a peanut challenge in August following a negative RAST and skin test. The skin test was done just prior to the challenge. She had tested positive to both peanut and egg via skin test at age two. She had a 5mm peanut wheal and a 6mm egg wheal. We did a RAST for egg at the time and it was below 2. The allergist did a challenge based on those numbers and she passed with no trouble.
So, it is possible to still test positive on a skin test and have outgrown the allergy. When we did her skin test for peanut allergy I also had them test for egg to see if it was still positive. This time both tests were completely negative, not even the tiniest mark.
Anyway, good luck. I'll be praying that you have great results. Please let us know what happens.
Oh, dd now eats peanut butter every couple of days. Her allergist told us she should eat it regularly so I give it to her only under my supervision. She doesn't eat foods with peanuts at preschool or anywhere that I'm not around to watch for a reaction.
Shannon

Posted on: Fri, 12/22/2006 - 3:12am
tigganroo's picture
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Joined: 04/26/2005 - 09:00

Shannon-thank you for your repy. I read it last night before our appt, and you gave me hope [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]
Unfortunately we are back and she failed the skin prick test. It was pretty obvious she is still allergic so we didn't proceed.
[img]http://uumor.pair.com/nutalle2/peanutallergy/frown.gif[/img] [img]http://uumor.pair.com/nutalle2/peanutallergy/frown.gif[/img] [img]http://uumor.pair.com/nutalle2/peanutallergy/frown.gif[/img]

Posted on: Fri, 12/22/2006 - 4:04am
mckennakatesmom's picture
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Joined: 09/07/2004 - 09:00

I'm sorry to hear that. How big was the wheal? Did the allergist still seem hopeful that she has a good chance to outgrow? Maybe another year or two of avoidance and she'll pass the skin test.
Is her skin really sensitive? Does she have eczema or break out easily from detergents, perfumes, etc.? I just wonder if that has an effect on whether someone will continue to test positive once the allergy is gone. I've read that some people skin test positive for their whole lives, even when they are no longer allergic.
At least the negative RAST is a good sign. I'm sorry you didn't get a different outcome but don't lose hope.
Shannon

Posted on: Fri, 12/22/2006 - 4:19am
tigganroo's picture
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Joined: 04/26/2005 - 09:00

Shannon-thanks, I really appreciate your support. She does have sensitive skin. She doesn't itch it but has red and bumpy skin all over her arms and legs, sometimes back and chest. Her cheeks are many times red a splotchy.
Her allergist would like us to come back in 6mos. He seemed hopeful. One of the problems we had today is that the histamine (sp?) prick test didn't really welt up. He kept asking me if I had given her something, but I didn't. He wanted to test again (on her back) for a better control but because her peanut prick swelled up I declined. I'm not sure how big it was, I didn't ask.
thanks again. [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]
-just a mom who'd love to take all the pain and worries from her child.

Posted on: Mon, 12/25/2006 - 2:23am
mckennakatesmom's picture
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Joined: 09/07/2004 - 09:00

I just re-read your original post. Did your daughter skin test negative before challenging milk, egg, and soy? I'm just curious as to whether she passed a challenge after having a skin reaction, just as my dd did with egg.
It might be helpful to ask them to skin test her for those things again. Since you know she is no longer allergic to those foods, a positive skin test may be a good sign that she has reactive skin as I mentioned previously.
At least you have some hope that she may be on the way to outgrowing this.
Shannon
Shannon

Posted on: Mon, 12/25/2006 - 6:48am
BENSMOM's picture
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Joined: 05/20/2000 - 09:00

My understanding is that a skin prick test can remain positive after outgrowing an allergy--they have a high rate of false positives anyway. A negative skin prick test is a pretty sure thing,as is a negative RAST. Good luck.

Posted on: Wed, 12/20/2006 - 5:52am
SallyL's picture
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Joined: 02/20/2006 - 09:00

We've never had a food challenge, so it hasn't come up for us, but I've read that alot of allergists will do a skin prick test just prior (or at a prior appointment) to doing the food challenge. I guess that's a little more accurate? Or at least a double check measure.

Posted on: Thu, 12/21/2006 - 3:40am
tigganroo's picture
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Joined: 04/26/2005 - 09:00

thank you very much for your response. I know this board probably gets the same questions all the time and ppl get tired of answering them so I really do appreciate it, thanks!
I have since called the dr and expressed my concerns and we will be doing a skin prick test first. [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]
I don't want to get my hopes up...but oh what a wonderful Christmas miracle this could be....

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