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Posted on: Tue, 06/24/2003 - 2:15pm
Driving Me Nutty's picture
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Joined: 05/01/2003 - 09:00

My ped ordered a RAST for my 22 mo old dd after a topical reaction to peanuts. Then we went to see the allergist, he wanted a CAP RAST done. Although I didn't want to put her through the horror of another blood draw, I understood the benefits.
Versus RAST, he claims that it is more consistent from lab to lab and that the result is more conclusive and predictive. If a low score on the CAP RAST the higher chance of growing out of it. And if under 15, there is only a 98% chance of having a severe reaction. My dd scored a 5 on the RAST (0-6 range) and >100 on the CAP RAST which is only scored 0-100 (6 levels within that). Based on her high score, he then suggested that we should not her be in an enclosed environment with peanuts as she might react to the proteins in the air.
Here's a link to one website comparing the 2 [url="http://www.isitallergy.com/physician/testcomp.asp"]http://www.isitallergy.com/physician/testcomp.asp[/url]
And here's another comparing the reliability of the tests [url="http://www.acs.ohio-state.edu/units/research/archive/allercap1.htm"]http://www.acs.ohio-state.edu/units/research/archive/allercap1.htm[/url]
[This message has been edited by Driving Me Nutty (edited June 25, 2003).]

Posted on: Wed, 06/25/2003 - 12:34am
Westporter's picture
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Joined: 06/25/2003 - 09:00

I am new to this board and am upset about the skin vs blood test. My ds at 1years old was skin tested and was positive for peanuts. So, does that mean he may never outgrow this allergy? I read that 20% of kids do outgrow the peanut allergy (or am I being optimistic?) Has anyone outgrown peanut allergies that you know of?

Posted on: Wed, 06/25/2003 - 1:27am
Gwen 5's picture
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Joined: 01/24/2003 - 09:00

Kami Mom,
You are right I am asking about my dd who will be 3 in Oct. of this year. My older dd is PA/TN allergic. My younger one has not been exposed, nor reacted to any PA products.
I want to get her tested as she will start preschool in the fall and I feel like we need to know.
I am not sure I have figured out the answer based on the replies though.
The allergist say's skin testing is the most accurate, but I don't want to have that be an exposure for her. Does it sound like the CAP-RAST is the way to go???
Thanks for everything,
Gwen

Posted on: Wed, 06/25/2003 - 1:56am
anonymous's picture
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Joined: 05/28/2009 - 16:42

Hi Westporter -- Yes there is research that states that certain children can outgrow their PA. Typically those that have been shown to outgrow it are diagnosed fairly young, absolutely avoid the allergen (including cross-contaminated food, like "may contains"), and do not have asthma.
And yes, I know someone who outgrew the allergy -- my 5 year old daughter!
HOWEVER, there is also research showing some children can get the allergy back. And that is the fear that I am living with right now.
Since you are new the the PA, there's a lot to learn. There's a wealth of information on this site, so please educate yourself. As you will find, not all allergists are as educated as some of the people on this board!
Did you have your 1-year old tested because of a reaction?
Gwen's Mom - As I mentioned in my previous post, Dr. Wood says that there is nothing you can learn by testing an unexposed child who is less than three. I would wait until she turns three. I am facing the exact same issue with my 2 1/2 year old. Basically, I have told the preschool the situation -- that she is to eat no food unless I have provided it or preapproved it. Then hopefully when she turns 3 (and tests negative!) we won't have to worry.
Samirosenjacken -- Don't know why Dr. Wood did a RAST instead of a CAP-RAST. Everything he has told me indicates the CAP-RAST is the ultimate test.
[This message has been edited by Kami's Mom (edited June 25, 2003).]

Posted on: Wed, 06/25/2003 - 3:57am
Westporter's picture
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Joined: 06/25/2003 - 09:00

Hi Kami's mom,
My son (now 16 months old) went to an allergist because I thought he was allergic to milk. He is allergic to milk, egg & peanuts. I never had given him any form of peanuts prior to that knowing not to give him any til age 3.
I strongly believe (and feel quite guilty about it) that I gave him the peanut allergy. When I was 28 weeks pregnant, I was diagnosed with gestational diabetes. On the food program I followed contained peanuts and peanut butter for protein among other foods. I ate peanut butter and/or peanuts every day for protein (in the morning, and 2 snacks) because I am not a big fan of cheese, etc for protein. I NEVER thought about peanut allergies, it didn't occur to me since I have never been around someone with it.
Anyhow, I asked my son's pediatrician why the peanut butter & peanuts were on the list that the hospital gave me and she said that its not known what causes the allergy. But, I am convinced that my eating it every day caused this. Plus, there is no mention in any of my pregnancy books to stay away from peanuts. Any thought on this forum members?
Congratulations that your child outgrew it. Also, should I join the peanut allergy group for $25? I am a member of FAAN.
Thanks for the input.

Posted on: Wed, 06/25/2003 - 6:57am
anonymous's picture
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Joined: 05/28/2009 - 16:42

Hey Westporter,
I know you feel guilty, but it's not your fault. You were only following the advice of medical professionals who should know better. Yes there are studies that show that sensitization can occur in the last trimester of pregnancy as well as through breastfeeding. It kills me that there seem to be no OBs or pediatricians who know about this. It's not until after our kids get the allergy that we find out all this stuff that we should have been doing.
About the skin test results: This excerpt is taken from a food allergy conference I attended last year as presented by Dr. Wood, a leading food allergist at Johns Hopkins:
"The problem with allergy testing is that there are a large number of inaccurate reults from both skin testing and blood testing...There are two main reasons for these false positive tests. First, it is possible to have enough IgE antibody to produce a positive allergy test but still be able to eat that food without difficulty. Second, when you are truly alergic to one food, it is common to have positive tests to other related foods..."
So when skin tests are not performed in response to an obvious reaction, I think their validity needs to be questioned.
I have been told that it is useless to test a child younger than 3 for a specific food allergy (unless of course that child has had a reaction). I don't know if this is because such a test on such a child may incorrectly show a positive result; or incorrectly show a negative result.
Given this information, perhaps there is hope that your child is not PA after all. And if the allergy is true, there is also hope that it could be outgrown.
Good luck!
[This message has been edited by Kami's Mom (edited June 25, 2003).]

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